Celtic defender Daniel Majstorovic has vowed not to let a ruptured cruciate ligament end his career as well as his treble and Euro 2012 dreams.
The Swede suffered the injury to his left knee in a training-ground collision ahead of his country's friendly against Croatia and is likely to be out for at least six months.
"I will do all I can to get back as quickly as possible," he told the Swedish FA's official website.
With Celtic on a 20-match winning run in domestic football and aiming for three trophies, and Sweden facing England, France and Ukraine in the European Championship in June, the injury could not have come at a worse time in any player's career.
But with Majstorovic turning 35 in April and out of contract at Celtic Park at the end of the season, the timing is doubly bad. The former Basel and AEK Athens defender will undergo surgery in his homeland but he has already vowed to return to top-level football.
He added: "I still feel I have a lot to offer on the football pitch and I won't give up on my career just for this.
"At the same time I fully understand how serious this is and the work I need to put in to get back."
Celtic manager Neil Lennon said in early December it would be difficult not to offer Majstorovic a new deal if he maintained his form.
Majstorovic soon said there was "no panic" over a new deal as he concentrated on Celtic's season and Euro 2012, but he then suffered a fractured eye socket against St Johnstone on December 18, which kept him out for almost eight weeks.
Majstorovic has been on the bench in recent weeks with Thomas Rogne and Kelvin Wilson returning to fitness and form in central defence. Charlie Mulgrew has also played there recently, while Glenn Loovens is pushing for a comeback after more than two months out injured.