diff --git a/services/router/main.py b/services/router/main.py
index b5ac1fe2..aa83a826 100644
--- a/services/router/main.py
+++ b/services/router/main.py
@@ -338,12 +338,12 @@ def _numeric_contract_present(text: str) -> bool:
     has_explicit_source = any(
         re.search(pattern, low) is not None
         for pattern in (
-            r"\bsheet\s*[:#]?\s*[a-z0-9_]+",
-            r"\brow\s*[:#]?\s*\d+",
-            r"\bрядок\s*[:#]?\s*\d+",
-            r"\bлист\s*[:#]?\s*[a-zа-я0-9_]+",
-            r"\bcell\s*[:#]?\s*[a-z]+\d+",
-            r"\bкомірк[а-я]*\s*[:#]?\s*[a-zа-я]+\d+",
+            r"\bsheet(?:\s*[:#]\s*[a-z0-9_]+|\s+[a-z0-9_]+![a-z]+\d+)",
+            r"\brow\s*[:#]\s*\d+",
+            r"\bрядок\s*[:#]\s*\d+",
+            r"\bлист(?:\s*[:#]\s*[a-zа-я0-9_]+|\s+[a-zа-я0-9_]+![a-zа-я]+\d+)",
+            r"\bcell\s*[:#]\s*[a-z]+\d+",
+            r"\bкомірк[а-я]*\s*[:#]\s*[a-zа-я]+\d+",
             r"\bsource\s*[:#]",
             r"\bджерел[оа]\s*[:#]",
         )