Belfast welterweight ‘Pat-Man’ suffered the injury in one of his final sparring sessions before the huge card at The SSE Arena and will delay his bout with ‘Hellraiser’ Corcoran as he sets about rehabilitation.
Gallagher said: “It goes without saying that I’m gutted with what’s happened.
“I guess I’ll have to buy a ticket off myself and go and support all the lads as a spectator! Seeing them all fight will soften the blow.
“It’s just one of those things that can happen in the sport of boxing, unfortunately. I’ll come back more determined, stronger and better than ever.
“Myself against Gary Corcoran remains a massive fight and I hope it will happen before the end of the year.
“It may end up that when it does happen, the fight has even more on the line than it would have done. We will make this fight happen.”