Scott Quigg has undergone surgery after suffering a broken jaw during his points defeat to Carl Frampton in Manchester on Saturday night.
Quigg was injured by a punch from Frampton in the fourth round, but was able to continue fighting and went the distance before losing a hard-fought contest in a split decision.
"He caught me with an uppercut and has broken my jaw so that put a bit of a spanner in the works," Quigg told Sky Sports News HQ after the fight.
"I had to have round five off then just to see what the damage was like, if it was going to be painful when I got hit. Luckily it wasn't, it was just numb. It felt like I had been to the dentist's and had an injection."
Quigg's promoter Eddie Hearn revealed on Twitter on Sunday morning that the Bury fighter was having surgery and also posted pictures of the X-rays.
"Thoughts with Scott Quigg currently undergoing surgery on broken jaw..you will be back stronger!" wrote Hearn.
Later on Sunday evening, Quigg posted a picture from his hospital bed on his official Twitter account after going under the knife.
"Very sore but a very successful operation… can't thank you enough for all the support. I will be back soon," vowed Quigg.
Frampton took the WBA super-bantamweight title from Quigg with his victory to add to his IBF belt after receiving two scores of 116-112 from the judges, with the third scoring it 115-113 for Quigg, who is now hoping for a rematch.
"I just want the rematch if I can have the chance, because I really do think if I start quicker next time it will be a different story," said the 27-year-old.
"He came in [after the fight] and there is respect there. I respect him as a fighter, he respects me and the teams respect each other.
"We have both been in there in a great fight and I'm just hoping we can do it again because I know I have got the beating of him."
Manchester United and England captain Wayne Rooney, who is recovering from a knee injury at present, was on hand to console Quigg after the fight.
Quigg said: "He said to keep my chin up - I said I'd have to keep it straight first!
"He was just saying he has lost a Champions League final and it hurts - but you have to learn from it and come back stronger.
"I'm very grateful for someone of his stature to come and give me those words."