Celtic have confirmed winger Jonny Hayes suffered a broken leg in the 2-0 Boxing Day win over Dundee and is unlikely to play again this season.
Hayes, 30, and Dundee defender Josh Meekings were both substituted after colliding together in a challenge at Dens Park on Tuesday, with the former carried from the field on a stretcher as a result.
Celtic manager Brendan Rodgers had said after the game that he was hopeful Hayes only suffered bruising to his shin, but tests have confirmed a broken leg.
"Celtic Football Club has to report that, regrettably, Jonny Hayes suffered a broken leg during the game against Dundee at Dens Park," the club said in a statement.
"Jonny had surgery today and will now be out for some time as he begins the long road back to full fitness.
"He will make a full recovery but he's unlikely to feature again this season.
"He will receive the best care and attention throughout the months ahead, while the thoughts and best wishes of everyone at Celtic and, indeed, the whole Celtic family, are with Jonny."