diff --git a/homeassistant/components/google_assistant_sdk/config_flow.py b/homeassistant/components/google_assistant_sdk/config_flow.py
index cd78c90e297..48c92832483 100644
--- a/homeassistant/components/google_assistant_sdk/config_flow.py
+++ b/homeassistant/components/google_assistant_sdk/config_flow.py
@@ -66,10 +66,6 @@ class OAuth2FlowHandler(
                 self._get_reauth_entry(), data=data
             )
 
-        if self._async_current_entries():
-            # Config entry already exists, only one allowed.
-            return self.async_abort(reason="single_instance_allowed")
-
         return self.async_create_entry(
             title=DEFAULT_NAME,
             data=data,
diff --git a/homeassistant/components/google_assistant_sdk/manifest.json b/homeassistant/components/google_assistant_sdk/manifest.json
index b6281e2a4f0..9c3a3e03dfd 100644
--- a/homeassistant/components/google_assistant_sdk/manifest.json
+++ b/homeassistant/components/google_assistant_sdk/manifest.json
@@ -8,5 +8,6 @@
   "integration_type": "service",
   "iot_class": "cloud_polling",
   "quality_scale": "platinum",
-  "requirements": ["gassist-text==0.0.11"]
+  "requirements": ["gassist-text==0.0.11"],
+  "single_config_entry": true
 }
diff --git a/tests/components/google_assistant_sdk/test_config_flow.py b/tests/components/google_assistant_sdk/test_config_flow.py
index b6ee701b228..332610e74e8 100644
--- a/tests/components/google_assistant_sdk/test_config_flow.py
+++ b/tests/components/google_assistant_sdk/test_config_flow.py
@@ -157,10 +157,6 @@ async def test_reauth(
     assert config_entry.data["token"].get("refresh_token") == "mock-refresh-token"
 
 
-@pytest.mark.parametrize(  # Remove when translations fixed
-    "ignore_translations",
-    ["component.google_assistant_sdk.config.abort.single_instance_allowed"],
-)
 @pytest.mark.usefixtures("current_request_with_host")
 async def test_single_instance_allowed(
     hass: HomeAssistant,
@@ -182,37 +178,7 @@ async def test_single_instance_allowed(
     result = await hass.config_entries.flow.async_init(
         "google_assistant_sdk", context={"source": config_entries.SOURCE_USER}
     )
-    state = config_entry_oauth2_flow._encode_jwt(
-        hass,
-        {
-            "flow_id": result["flow_id"],
-            "redirect_uri": "https://example.com/auth/external/callback",
-        },
-    )
 
-    assert result["url"] == (
-        f"{GOOGLE_AUTH_URI}?response_type=code&client_id={CLIENT_ID}"
-        "&redirect_uri=https://example.com/auth/external/callback"
-        f"&state={state}&scope=https://www.googleapis.com/auth/assistant-sdk-prototype"
-        "&access_type=offline&prompt=consent"
-    )
-
-    client = await hass_client_no_auth()
-    resp = await client.get(f"/auth/external/callback?code=abcd&state={state}")
-    assert resp.status == 200
-    assert resp.headers["content-type"] == "text/html; charset=utf-8"
-
-    aioclient_mock.post(
-        GOOGLE_TOKEN_URI,
-        json={
-            "refresh_token": "mock-refresh-token",
-            "access_token": "mock-access-token",
-            "type": "Bearer",
-            "expires_in": 60,
-        },
-    )
-
-    result = await hass.config_entries.flow.async_configure(result["flow_id"])
     assert result.get("type") is FlowResultType.ABORT
     assert result.get("reason") == "single_instance_allowed"