diff --git a/odata_query/sql/base.py b/odata_query/sql/base.py
index ec3b119..239421c 100644
--- a/odata_query/sql/base.py
+++ b/odata_query/sql/base.py
@@ -236,7 +236,7 @@ def _to_pattern(self, arg: ast._Node, prefix: str = "", suffix: str = "") -> str
         Transform a node into a pattern usable in `LIKE` clauses.
         :meta private:
         """
-        if isinstance(arg, ast.Identifier):
+        if isinstance(arg, (ast.Identifier, ast.Call)):
             res = self.visit(arg)
             if prefix:
                 res = f"'{prefix}' || " + res
diff --git a/tests/integration/django/test_odata_to_django_q.py b/tests/integration/django/test_odata_to_django_q.py
index 3dc0d7d..c442748 100644
--- a/tests/integration/django/test_odata_to_django_q.py
+++ b/tests/integration/django/test_odata_to_django_q.py
@@ -234,6 +234,11 @@ def tz(offset: int) -> dt.tzinfo:
             "contains(title, 'TEST') eq false",
             Q(contains_title_test__exact=Value(False)),
         ),
+        # GITHUB-47
+        (
+            "contains(tolower(name), tolower('A'))",
+            Q(name__lower__contains=fn.Lower(Value("A"))),
+        ),
     ],
 )
 def test_odata_filter_to_django_q_pre_v4(
@@ -565,6 +570,11 @@ def test_odata_filter_to_django_q_pre_v4(
             "contains(title, 'TEST') eq false",
             Q(lu.Exact(lu.Contains(F("title"), Value("TEST")), Value(False))),
         ),
+        # GITHUB-47
+        (
+            "contains(tolower(name), tolower('A'))",
+            Q(lu.Contains(fn.Lower(F("name")), fn.Lower(Value("A")))),
+        ),
     ],
 )
 def test_odata_filter_to_django_q_after_v4(
diff --git a/tests/integration/sql/test_odata_to_athena_sql.py b/tests/integration/sql/test_odata_to_athena_sql.py
index 13efdea..7ca5788 100644
--- a/tests/integration/sql/test_odata_to_athena_sql.py
+++ b/tests/integration/sql/test_odata_to_athena_sql.py
@@ -101,6 +101,11 @@
             "measurement_class eq 'C' and endswith(data_collector, 'rie')",
             "\"measurement_class\" = 'C' AND \"data_collector\" LIKE '%rie'",
         ),
+        # GITHUB-47
+        (
+            "contains(tolower(name), tolower('A'))",
+            "LOWER(\"name\") LIKE '%' || LOWER('A') || '%'",
+        ),
     ],
 )
 def test_odata_filter_to_sql(odata_query: str, expected: str, lexer, parser):
diff --git a/tests/integration/sql/test_odata_to_sql.py b/tests/integration/sql/test_odata_to_sql.py
index 4e472bd..7c1b250 100644
--- a/tests/integration/sql/test_odata_to_sql.py
+++ b/tests/integration/sql/test_odata_to_sql.py
@@ -103,6 +103,11 @@
             "measurement_class eq 'C' and endswith(data_collector, 'rie')",
             "\"measurement_class\" = 'C' AND \"data_collector\" LIKE '%rie'",
         ),
+        # GITHUB-47
+        (
+            "contains(tolower(name), tolower('A'))",
+            "LOWER(\"name\") LIKE '%' || LOWER('A') || '%'",
+        ),
     ],
 )
 def test_odata_filter_to_sql(
diff --git a/tests/integration/sql/test_odata_to_sqlite.py b/tests/integration/sql/test_odata_to_sqlite.py
index e65a061..31ceb5b 100644
--- a/tests/integration/sql/test_odata_to_sqlite.py
+++ b/tests/integration/sql/test_odata_to_sqlite.py
@@ -104,6 +104,11 @@
             "measurement_class eq 'C' and endswith(data_collector, 'rie')",
             "\"measurement_class\" = 'C' AND \"data_collector\" LIKE '%rie'",
         ),
+        # GITHUB-47
+        (
+            "contains(tolower(name), tolower('A'))",
+            "LOWER(\"name\") LIKE '%' || LOWER('A') || '%'",
+        ),
     ],
 )
 def test_odata_filter_to_sql(odata_query: str, expected: str, lexer, parser):
diff --git a/tests/integration/sql/test_querying.py b/tests/integration/sql/test_querying.py
index ba80c27..3312d50 100644
--- a/tests/integration/sql/test_querying.py
+++ b/tests/integration/sql/test_querying.py
@@ -55,6 +55,7 @@ def sample_data_sess(db_conn, db_schema):
         ("blogpost", "year(published_at) eq 2019", 1),
         # GITHUB-19
         ("blogpost", "contains(title, 'Query') eq true", 1),
+        ("blogpost", "contains(tolower(title), tolower('Query'))", 1),
     ],
 )
 def test_query_with_odata(
diff --git a/tests/integration/sqlalchemy/test_odata_to_sqlalchemy_core.py b/tests/integration/sqlalchemy/test_odata_to_sqlalchemy_core.py
index 6c37fcb..e82f2a8 100644
--- a/tests/integration/sqlalchemy/test_odata_to_sqlalchemy_core.py
+++ b/tests/integration/sqlalchemy/test_odata_to_sqlalchemy_core.py
@@ -261,6 +261,11 @@ def tz(offset: int) -> dt.tzinfo:
             "contains(title, 'TEST') eq true",
             BlogPost.c.title.contains("TEST") == True,  # noqa:E712
         ),
+        # GITHUB-47
+        (
+            "contains(tolower(title), tolower('A'))",
+            functions_ext.lower(BlogPost.c.title).contains(functions_ext.lower("A")),
+        ),
     ],
 )
 def test_odata_filter_to_sqlalchemy_query(
diff --git a/tests/integration/sqlalchemy/test_odata_to_sqlalchemy_orm.py b/tests/integration/sqlalchemy/test_odata_to_sqlalchemy_orm.py
index adb6f00..495d8ca 100644
--- a/tests/integration/sqlalchemy/test_odata_to_sqlalchemy_orm.py
+++ b/tests/integration/sqlalchemy/test_odata_to_sqlalchemy_orm.py
@@ -197,6 +197,11 @@ def tz(offset: int) -> dt.tzinfo:
             "contains(title, 'TEST') eq true",
             BlogPost.title.contains("TEST") == True,  # noqa:E712
         ),
+        # GITHUB-47
+        (
+            "contains(tolower(title), tolower('A'))",
+            functions_ext.lower(BlogPost.title).contains(functions_ext.lower("A")),
+        ),
     ],
 )
 def test_odata_filter_to_sqlalchemy_query(