Police are treating the criminal damage at Henry Jones Playing Fields as sectarian. It follows a series of incidents targeting the club.
“I stand by East Belfast GAA after this latest hate-filled incident and I call on all parties to do the same,” said Councillor Long.
“This is sadly not the first time the club has been targeted. It is beyond tiresome that a club just wanting to play sport and contribute positively to the local community once again faces this bigotry and hatred.
“I call on anyone with information on this incident to contact police with it immediately.”