Gannon holds a unique record, having scored in all four English divisions, the FA Cup, the League Cup, the Full Members Cup, the English League play-offs, the League of Ireland, the FAI Cup, the League of Ireland Cup, and the UEFA Champions League. He has received two distinguished honours from Stockport's supporters since leaving the club – being elected to the Stockport Hall of Fame and as Honorary Vice President of the Hatters Independent Supporters Club. His 479 club appearances puts him in third spot in Stockport's all-time appearance list and his 65 goals are ninth in their scoring records.