diff --git a/lib/crewai/src/crewai/llms/providers/openai_compatible/completion.py b/lib/crewai/src/crewai/llms/providers/openai_compatible/completion.py
index da4cfd03db..fcb3f810c0 100644
--- a/lib/crewai/src/crewai/llms/providers/openai_compatible/completion.py
+++ b/lib/crewai/src/crewai/llms/providers/openai_compatible/completion.py
@@ -15,6 +15,7 @@
 from dataclasses import dataclass, field
 import os
 from typing import Any
+from urllib.parse import urlsplit, urlunsplit
 
 from pydantic import model_validator
 
@@ -91,23 +92,39 @@ class ProviderConfig:
     ),
 }
 
+_OLLAMA_DEFAULT_PORT = 11434
+
 
 def _normalize_ollama_base_url(base_url: str) -> str:
-    """Normalize Ollama base URL to ensure it ends with /v1.
+    """Normalize an Ollama base URL into a full OpenAI-compatible endpoint.
 
-    Ollama uses OLLAMA_HOST which may not include the /v1 suffix,
-    but the OpenAI-compatible endpoint requires it.
+    ``OLLAMA_HOST`` follows Ollama's own convention and may be a bare host
+    (``0.0.0.0``), a ``host:port`` pair (``127.0.0.1:11434``), or a full URL.
+    Whichever parts are missing are filled in: ``http://`` when no scheme is
+    given, the default Ollama port when none is given and the scheme is
+    ``http`` (``https`` implies 443), and the ``/v1`` suffix that the
+    OpenAI-compatible endpoint requires.
 
     Args:
-        base_url: The base URL, potentially without /v1 suffix.
+        base_url: The base URL, potentially missing scheme, port or /v1.
 
     Returns:
-        The base URL with /v1 suffix if needed.
+        A fully-qualified base URL ending in /v1.
     """
-    base_url = base_url.rstrip("/")
-    if not base_url.endswith("/v1"):
-        return f"{base_url}/v1"
-    return base_url
+    if "://" not in base_url:
+        base_url = f"http://{base_url}"
+
+    parts = urlsplit(base_url)
+
+    netloc = parts.netloc
+    if parts.scheme == "http" and parts.port is None:
+        netloc = f"{netloc}:{_OLLAMA_DEFAULT_PORT}"
+
+    path = parts.path.rstrip("/")
+    if not path.endswith("/v1"):
+        path = f"{path}/v1"
+
+    return urlunsplit((parts.scheme, netloc, path, parts.query, parts.fragment))
 
 
 class OpenAICompatibleCompletion(OpenAICompletion):
diff --git a/lib/crewai/tests/llms/openai_compatible/test_openai_compatible.py b/lib/crewai/tests/llms/openai_compatible/test_openai_compatible.py
index ce856a5334..d8747571ff 100644
--- a/lib/crewai/tests/llms/openai_compatible/test_openai_compatible.py
+++ b/lib/crewai/tests/llms/openai_compatible/test_openai_compatible.py
@@ -114,7 +114,34 @@ def test_strips_trailing_slash(self):
     def test_handles_v1_with_trailing_slash(self):
         """Test /v1/ is normalized."""
         assert _normalize_ollama_base_url("http://localhost:11434/v1/") == "http://localhost:11434/v1"
-
+        
+    def test_bare_host_gets_scheme_and_port(self):
+        """Bare host from OLLAMA_HOST gets http:// and the default port."""
+        assert _normalize_ollama_base_url("0.0.0.0") == "http://0.0.0.0:11434/v1"
+
+    def test_bare_localhost_gets_scheme_and_port(self):
+        """Bare localhost gets http:// and the default port."""
+        assert _normalize_ollama_base_url("localhost") == "http://localhost:11434/v1"
+
+    def test_host_port_without_scheme_gets_scheme(self):
+        """host:port without a scheme gets http:// prepended."""
+        assert _normalize_ollama_base_url("127.0.0.1:11434") == "http://127.0.0.1:11434/v1"
+
+    def test_lan_host_port_without_scheme(self):
+        """A LAN host:port without a scheme gets http:// prepended."""
+        assert _normalize_ollama_base_url("192.168.1.5:11434") == "http://192.168.1.5:11434/v1"
+
+    def test_https_url_keeps_scheme_and_gets_no_default_port(self):
+        """An explicit https:// URL keeps its scheme and gets no default port."""
+        assert _normalize_ollama_base_url("https://ollama.example.com") == "https://ollama.example.com/v1"
+
+    def test_root_path_with_query_does_not_double_slash(self):
+        """A root path alongside a query yields /v1, not //v1."""
+        assert _normalize_ollama_base_url("http://ollama/?tenant=acme") == "http://ollama:11434/v1?tenant=acme"
+
+    def test_trailing_slash_in_query_is_preserved(self):
+        """Only the path is stripped, so a query ending in / keeps that character."""
+        assert _normalize_ollama_base_url("http://ollama:11434/?x=a/") == "http://ollama:11434/v1?x=a/"
 
 class TestOpenAICompatibleCompletion:
     """Tests for OpenAICompatibleCompletion class."""