Before Patsy Gallacher joined Celtic, he was primarily associated with the club Clydebank Juniors. There isn't much detailed public information about other specific clubs that showed interest in him before his move to Celtic. Gallacher's talent was evident early on, and he made a significant impact at Celtic, becoming one of their legendary players. If you are looking for more detailed historical records, it might be worth checking archives or historical football records related to early 20th-century Scottish football.