His first league goal for Rangers came against St Mirren at Love Street on 17 September 1977 in a 3 -- 3 draw .
Cooper appeared in 52 of Rangers 53 matches in the 1977 -- 78 season , as Jock Wallace 's side won the domestic treble .
Cooper 's first league goal Rangers Rangers came against St Mirren at Love Street on 17 September 1977 in a 3 -- 3 draw .
Cooper appeared in 52 of Rangers 53 matches in the 1977 -- 78 season , as Jock Wallace 's side won the domestic treble .