The former Westlife singer is due to compete on Dancing on Ice for the first time on Sunday evening, but his performance with professional partner Alex Murphy is in jeopardy after he suffered the agonising injury during rehearsals.
ITV told website DigitalSpy that the 38-year-old star has partially dislocated his shoulder and damaged his rotator cuff so is unable to rehearse.
Read more: Ashley Banjo reveals Dancing On Ice stand-in
A decision on whether he can compete or not will be made later in the day.
The news of Brian’s injury came a few days after Alex revealed his confidence had been rocked after he suffered a fall on the ice during training earlier in the week.
She said: “We had a fall, it was pretty bad.
“He was really anxious after that but I told him not to worry and hopefully it’s out of his system.”
However, Alex believes he has nothing to worry about and she can’t wait for him to show off his skills on the ice.
She said: “He has come on drastically from when he first started and could hardly stand on the ice. “He’s also lost weight from all the training, but he doesn’t think so because he still eats burgers.”
Meanwhile, fellow competitor Melody Thornton recently admitted she has had a number of accidents during rehearsals, including smashing her face on the ice.
Read more: Cheryl receiving nasty messages from stalker
The former Pussycat Dolls singer said: “The worst for me is there’s a little bitty part of the blade in the back of your skate that if you put your other skate on top of that and then move an inch, you will just fall out of nowhere.
“It’s like getting shot. It’s crazy.
“I was trying to put one foot behinds the other and I stepped on my blade and went backwards flying but landed on my face. It was so intense.
“You immediately want to cry. It’s like when you’re a kid and you can’t help it.
“I’ve fallen on my hips and things and the bruising is like, ‘Wow, OK’.”
Who is your favourite to win? Leave us a comment on our Facebook page @EntertainmentDailyFix and let us know what you think.