diff --git a/tests/integration/routing/test_team_wildcard_precedence.py b/tests/integration/routing/test_team_wildcard_precedence.py
new file mode 100644
index 00000000000..38fda682129
--- /dev/null
+++ b/tests/integration/routing/test_team_wildcard_precedence.py
@@ -0,0 +1,61 @@
+"""A team's own wildcard deployment serves that team's keys even when a proxy-wide wildcard of the
+same pattern exists, and the proxy-wide one serves every other key (#48490)."""
+
+import uuid
+from typing import Final
+
+import pytest
+from integration._support.client import Gateway, Scenario
+
+pytestmark: Final = pytest.mark.timeout(120)
+
+
+def _wildcard(scenario: Scenario, pattern: str, *, team_id: str | None) -> str:
+    identity: Final = f"wildcard-{uuid.uuid4().hex}"
+    scenario.gateway.post(
+        "/model/new",
+        {
+            "model_name": pattern,
+            "litellm_params": {
+                "model": "openai/*",
+                "api_key": f"provider-key-{identity}",
+                "api_base": f"{scenario.gateway.upstream_url}/v1",
+            },
+            "model_info": {"id": identity, **({"team_id": team_id} if team_id is not None else {})},
+        },
+    )
+    scenario.cleanups.callback(scenario.delete_model, identity)
+    return identity
+
+
+def _served_by(gateway: Gateway, key: str, model: str) -> str:
+    response: Final = gateway.request(
+        "POST",
+        "/v1/chat/completions",
+        {"model": model, "messages": [{"role": "user", "content": "wildcard precedence control"}]},
+        key=key,
+    )
+    assert response.status_code == 200, response.text
+    return response.headers["x-litellm-model-id"]
+
+
+def test_a_teams_wildcard_serves_its_keys_before_a_proxy_wide_wildcard_of_the_same_pattern(gateway: Gateway) -> None:
+    with gateway.scenario() as scenario:
+        byok_team: Final = scenario.team(models=[])
+        other_team: Final = scenario.team(models=[])
+        pattern: Final = f"byok-{uuid.uuid4().hex}/*"
+        team_wildcard: Final = _wildcard(scenario, pattern, team_id=byok_team)
+        shared_wildcard: Final = _wildcard(scenario, pattern, team_id=None)
+        model: Final = pattern.replace("*", "gpt-4o-mini")
+
+        served: Final = {
+            "byok team key": _served_by(gateway, scenario.key(team_id=byok_team), model),
+            "other team key": _served_by(gateway, scenario.key(team_id=other_team), model),
+            "key without a team": _served_by(gateway, scenario.key(), model),
+        }
+
+        assert served == {
+            "byok team key": team_wildcard,
+            "other team key": shared_wildcard,
+            "key without a team": shared_wildcard,
+        }