Initially signed in a wartime loan deal from Wolverhampton Wanderers Gerry McAloon made his debut for the Bhoys on September 18th 1943.

The inside forward scored the only goal of the match on that debut outing at Parkhead as Celtic defeated Hamilton in a Regional League tie. McAloon remained at Celtic Park for the remainder of that campaign where he scored 19 goals. He rejoined Celtic on a permanent basis in 1946 in a swap deal with Brentford which saw George Patterson go in the opposite direction.

Although a clever player Gerry had trouble combining his football career in Glasgow with working in London and then latterly in Ireland. Consequently he could not hold down a regular starting spot with the first team. He joined Belfast Celtic in August 1948 after 54 appearances and 30 goals for the Hoops.