diff --git a/integrations/fastembed/src/haystack_integrations/components/embedders/fastembed/embedding_backend/fastembed_backend.py b/integrations/fastembed/src/haystack_integrations/components/embedders/fastembed/embedding_backend/fastembed_backend.py
index 66f797549..3a68abcfb 100644
--- a/integrations/fastembed/src/haystack_integrations/components/embedders/fastembed/embedding_backend/fastembed_backend.py
+++ b/integrations/fastembed/src/haystack_integrations/components/embedders/fastembed/embedding_backend/fastembed_backend.py
@@ -1,4 +1,4 @@
-from typing import ClassVar, Dict, List, Optional
+from typing import Any, ClassVar, Dict, List, Optional
 
 from haystack.dataclasses.sparse_embedding import SparseEmbedding
 from tqdm import tqdm
@@ -73,14 +73,19 @@ def get_embedding_backend(
         cache_dir: Optional[str] = None,
         threads: Optional[int] = None,
         local_files_only: bool = False,
+        model_kwargs: Optional[Dict[str, Any]] = None,
     ):
-        embedding_backend_id = f"{model_name}{cache_dir}{threads}"
+        embedding_backend_id = f"{model_name}{cache_dir}{threads}{local_files_only}{model_kwargs}"
 
         if embedding_backend_id in _FastembedSparseEmbeddingBackendFactory._instances:
             return _FastembedSparseEmbeddingBackendFactory._instances[embedding_backend_id]
 
         embedding_backend = _FastembedSparseEmbeddingBackend(
-            model_name=model_name, cache_dir=cache_dir, threads=threads, local_files_only=local_files_only
+            model_name=model_name,
+            cache_dir=cache_dir,
+            threads=threads,
+            local_files_only=local_files_only,
+            model_kwargs=model_kwargs,
         )
         _FastembedSparseEmbeddingBackendFactory._instances[embedding_backend_id] = embedding_backend
         return embedding_backend
@@ -97,9 +102,16 @@ def __init__(
         cache_dir: Optional[str] = None,
         threads: Optional[int] = None,
         local_files_only: bool = False,
+        model_kwargs: Optional[Dict[str, Any]] = None,
     ):
+        model_kwargs = model_kwargs or {}
+
         self.model = SparseTextEmbedding(
-            model_name=model_name, cache_dir=cache_dir, threads=threads, local_files_only=local_files_only
+            model_name=model_name,
+            cache_dir=cache_dir,
+            threads=threads,
+            local_files_only=local_files_only,
+            **model_kwargs,
         )
 
     def embed(self, data: List[List[str]], progress_bar=True, **kwargs) -> List[SparseEmbedding]:
diff --git a/integrations/fastembed/src/haystack_integrations/components/embedders/fastembed/fastembed_sparse_document_embedder.py b/integrations/fastembed/src/haystack_integrations/components/embedders/fastembed/fastembed_sparse_document_embedder.py
index 4b72389fa..f79f08c90 100644
--- a/integrations/fastembed/src/haystack_integrations/components/embedders/fastembed/fastembed_sparse_document_embedder.py
+++ b/integrations/fastembed/src/haystack_integrations/components/embedders/fastembed/fastembed_sparse_document_embedder.py
@@ -62,6 +62,7 @@ def __init__(
         local_files_only: bool = False,
         meta_fields_to_embed: Optional[List[str]] = None,
         embedding_separator: str = "\n",
+        model_kwargs: Optional[Dict[str, Any]] = None,
     ):
         """
         Create an FastembedDocumentEmbedder component.
@@ -81,6 +82,7 @@ def __init__(
         :param local_files_only: If `True`, only use the model files in the `cache_dir`.
         :param meta_fields_to_embed: List of meta fields that should be embedded along with the Document content.
         :param embedding_separator: Separator used to concatenate the meta fields to the Document content.
+        :param model_kwargs: Dictionary containing model parameters such as `k`, `b`, `avg_len`, `language`.
         """
 
         self.model_name = model
@@ -92,6 +94,7 @@ def __init__(
         self.local_files_only = local_files_only
         self.meta_fields_to_embed = meta_fields_to_embed or []
         self.embedding_separator = embedding_separator
+        self.model_kwargs = model_kwargs
 
     def to_dict(self) -> Dict[str, Any]:
         """
@@ -110,6 +113,7 @@ def to_dict(self) -> Dict[str, Any]:
             local_files_only=self.local_files_only,
             meta_fields_to_embed=self.meta_fields_to_embed,
             embedding_separator=self.embedding_separator,
+            model_kwargs=self.model_kwargs,
         )
 
     def warm_up(self):
@@ -122,6 +126,7 @@ def warm_up(self):
                 cache_dir=self.cache_dir,
                 threads=self.threads,
                 local_files_only=self.local_files_only,
+                model_kwargs=self.model_kwargs,
             )
 
     def _prepare_texts_to_embed(self, documents: List[Document]) -> List[str]:
diff --git a/integrations/fastembed/src/haystack_integrations/components/embedders/fastembed/fastembed_sparse_text_embedder.py b/integrations/fastembed/src/haystack_integrations/components/embedders/fastembed/fastembed_sparse_text_embedder.py
index 67348b2bd..2ebab35b4 100644
--- a/integrations/fastembed/src/haystack_integrations/components/embedders/fastembed/fastembed_sparse_text_embedder.py
+++ b/integrations/fastembed/src/haystack_integrations/components/embedders/fastembed/fastembed_sparse_text_embedder.py
@@ -35,6 +35,7 @@ def __init__(
         progress_bar: bool = True,
         parallel: Optional[int] = None,
         local_files_only: bool = False,
+        model_kwargs: Optional[Dict[str, Any]] = None,
     ):
         """
         Create a FastembedSparseTextEmbedder component.
@@ -50,6 +51,7 @@ def __init__(
                 If 0, use all available cores.
                 If None, don't use data-parallel processing, use default onnxruntime threading instead.
         :param local_files_only: If `True`, only use the model files in the `cache_dir`.
+        :param model_kwargs: Dictionary containing model parameters such as `k`, `b`, `avg_len`, `language`.
         """
 
         self.model_name = model
@@ -58,6 +60,7 @@ def __init__(
         self.progress_bar = progress_bar
         self.parallel = parallel
         self.local_files_only = local_files_only
+        self.model_kwargs = model_kwargs
 
     def to_dict(self) -> Dict[str, Any]:
         """
@@ -74,6 +77,7 @@ def to_dict(self) -> Dict[str, Any]:
             progress_bar=self.progress_bar,
             parallel=self.parallel,
             local_files_only=self.local_files_only,
+            model_kwargs=self.model_kwargs,
         )
 
     def warm_up(self):
@@ -86,6 +90,7 @@ def warm_up(self):
                 cache_dir=self.cache_dir,
                 threads=self.threads,
                 local_files_only=self.local_files_only,
+                model_kwargs=self.model_kwargs,
             )
 
     @component.output_types(sparse_embedding=SparseEmbedding)
diff --git a/integrations/fastembed/tests/test_fastembed_backend.py b/integrations/fastembed/tests/test_fastembed_backend.py
index 631d9f1e0..994a6f883 100644
--- a/integrations/fastembed/tests/test_fastembed_backend.py
+++ b/integrations/fastembed/tests/test_fastembed_backend.py
@@ -2,6 +2,7 @@
 
 from haystack_integrations.components.embedders.fastembed.embedding_backend.fastembed_backend import (
     _FastembedEmbeddingBackendFactory,
+    _FastembedSparseEmbeddingBackendFactory,
 )
 
 
@@ -44,3 +45,28 @@ def test_embedding_function_with_kwargs(mock_instructor):  # noqa: ARG001
     embedding_backend.model.embed.assert_called_once_with(data)
     # restore the factory stateTrue
     _FastembedEmbeddingBackendFactory._instances = {}
+
+
+@patch("haystack_integrations.components.embedders.fastembed.embedding_backend.fastembed_backend.SparseTextEmbedding")
+def test_model_kwargs_initialization(mock_instructor):
+    bm25_config = {
+        "k": 1.2,
+        "b": 0.75,
+        "avg_len": 300.0,
+        "language": "english",
+        "token_max_length": 40,
+    }
+
+    # Invoke the backend factory with the BM25 configuration
+    _FastembedSparseEmbeddingBackendFactory.get_embedding_backend(
+        model_name="Qdrant/bm25",
+        model_kwargs=bm25_config,
+    )
+
+    # Check if SparseTextEmbedding was called with the correct arguments
+    mock_instructor.assert_called_once_with(
+        model_name="Qdrant/bm25", cache_dir=None, threads=None, local_files_only=False, **bm25_config
+    )
+
+    # Restore factory state after the test
+    _FastembedSparseEmbeddingBackendFactory._instances = {}
diff --git a/integrations/fastembed/tests/test_fastembed_sparse_document_embedder.py b/integrations/fastembed/tests/test_fastembed_sparse_document_embedder.py
index d3f2023b8..90e94908d 100644
--- a/integrations/fastembed/tests/test_fastembed_sparse_document_embedder.py
+++ b/integrations/fastembed/tests/test_fastembed_sparse_document_embedder.py
@@ -69,6 +69,7 @@ def test_to_dict(self):
                 "local_files_only": False,
                 "embedding_separator": "\n",
                 "meta_fields_to_embed": [],
+                "model_kwargs": None,
             },
         }
 
@@ -100,6 +101,7 @@ def test_to_dict_with_custom_init_parameters(self):
                 "local_files_only": True,
                 "meta_fields_to_embed": ["test_field"],
                 "embedding_separator": " | ",
+                "model_kwargs": None,
             },
         }
 
@@ -174,7 +176,11 @@ def test_warmup(self, mocked_factory):
         mocked_factory.get_embedding_backend.assert_not_called()
         embedder.warm_up()
         mocked_factory.get_embedding_backend.assert_called_once_with(
-            model_name="prithvida/Splade_PP_en_v1", cache_dir=None, threads=None, local_files_only=False
+            model_name="prithvida/Splade_PP_en_v1",
+            cache_dir=None,
+            threads=None,
+            local_files_only=False,
+            model_kwargs=None,
         )
 
     @patch(
@@ -275,6 +281,52 @@ def test_embed_metadata(self):
             parallel=None,
         )
 
+    def test_init_with_model_kwargs_parameters(self):
+        """
+        Test initialization of FastembedSparseDocumentEmbedder with model_kwargs parameters.
+        """
+        bm25_config = {
+            "k": 1.2,
+            "b": 0.75,
+            "avg_len": 300.0,
+            "language": "english",
+            "token_max_length": 50,
+        }
+
+        embedder = FastembedSparseDocumentEmbedder(
+            model="Qdrant/bm25",
+            model_kwargs=bm25_config,
+        )
+
+        assert embedder.model_kwargs == bm25_config
+
+    @pytest.mark.integration
+    def test_run_with_model_kwargs(self):
+        """
+        Integration test to check the embedding with model_kwargs parameters.
+        """
+        bm42_config = {
+            "alpha": 0.2,
+        }
+
+        embedder = FastembedSparseDocumentEmbedder(
+            model="Qdrant/bm42-all-minilm-l6-v2-attentions",
+            model_kwargs=bm42_config,
+        )
+        embedder.warm_up()
+
+        doc = Document(content="Example content using BM42")
+
+        result = embedder.run(documents=[doc])
+        embedding = result["documents"][0].sparse_embedding
+        embedding_dict = embedding.to_dict()
+
+        assert isinstance(embedding, SparseEmbedding)
+        assert isinstance(embedding_dict["indices"], list)
+        assert isinstance(embedding_dict["values"], list)
+        assert isinstance(embedding_dict["indices"][0], int)
+        assert isinstance(embedding_dict["values"][0], float)
+
     @pytest.mark.integration
     def test_run(self):
         embedder = FastembedSparseDocumentEmbedder(
diff --git a/integrations/fastembed/tests/test_fastembed_sparse_text_embedder.py b/integrations/fastembed/tests/test_fastembed_sparse_text_embedder.py
index 7e9197493..4f438fd15 100644
--- a/integrations/fastembed/tests/test_fastembed_sparse_text_embedder.py
+++ b/integrations/fastembed/tests/test_fastembed_sparse_text_embedder.py
@@ -54,6 +54,7 @@ def test_to_dict(self):
                 "progress_bar": True,
                 "parallel": None,
                 "local_files_only": False,
+                "model_kwargs": None,
             },
         }
 
@@ -79,6 +80,7 @@ def test_to_dict_with_custom_init_parameters(self):
                 "progress_bar": False,
                 "parallel": 1,
                 "local_files_only": True,
+                "model_kwargs": None,
             },
         }
 
@@ -135,7 +137,11 @@ def test_warmup(self, mocked_factory):
         mocked_factory.get_embedding_backend.assert_not_called()
         embedder.warm_up()
         mocked_factory.get_embedding_backend.assert_called_once_with(
-            model_name="prithvida/Splade_PP_en_v1", cache_dir=None, threads=None, local_files_only=False
+            model_name="prithvida/Splade_PP_en_v1",
+            cache_dir=None,
+            threads=None,
+            local_files_only=False,
+            model_kwargs=None,
         )
 
     @patch(
@@ -195,6 +201,54 @@ def test_run_wrong_incorrect_format(self):
         with pytest.raises(TypeError, match="FastembedSparseTextEmbedder expects a string as input"):
             embedder.run(text=list_integers_input)
 
+    def test_init_with_model_kwargs_parameters(self):
+        """
+        Test initialization of FastembedSparseTextEmbedder with model_kwargs parameters.
+        """
+        bm25_config = {
+            "k": 1.2,
+            "b": 0.75,
+            "avg_len": 300.0,
+            "language": "english",
+            "token_max_length": 50,
+        }
+
+        embedder = FastembedSparseTextEmbedder(
+            model="Qdrant/bm25",
+            model_kwargs=bm25_config,
+        )
+
+        assert embedder.model_kwargs == bm25_config
+
+    @pytest.mark.integration
+    def test_run_with_model_kwargs(self):
+        """
+        Integration test to check the embedding with model_kwargs parameters.
+        """
+        bm25_config = {
+            "k": 1.2,
+            "b": 0.75,
+            "avg_len": 256.0,
+        }
+
+        embedder = FastembedSparseTextEmbedder(
+            model="Qdrant/bm25",
+            model_kwargs=bm25_config,
+        )
+        embedder.warm_up()
+
+        text = "Example content using BM25"
+
+        result = embedder.run(text=text)
+        embedding = result["sparse_embedding"]
+        embedding_dict = embedding.to_dict()
+
+        assert isinstance(embedding, SparseEmbedding)
+        assert isinstance(embedding_dict["indices"], list)
+        assert isinstance(embedding_dict["values"], list)
+        assert isinstance(embedding_dict["indices"][0], int)
+        assert isinstance(embedding_dict["values"][0], float)
+
     @pytest.mark.integration
     def test_run(self):
         embedder = FastembedSparseTextEmbedder(