How long Callum McGregor could be out for as Celtic skipper sweats over knee injury

Celtic face an anxious wait to find out how long skipper Callum McGregor will be out of action for after a knee injury forced him off against RB Leipzig.

The captain trudged off in the first half in Germany as Ange Postecoglou's team succumbed to a damaging 3-1 Champions League defeat. He was determined to play on and Postecoglou revealed he picked up the injury shortly prior to Leipzig's opener, before playing on for more than ten minutes when he was eventually replaced by Oliver Abildgaard.

He didn't require a stretcher which was a source of encouragement, but the manager grimaced after the game: "It doesn't look good. We were a bit unlucky with the goal. He (McGregor) was about to have a shot and something happened between his knee, he put an enormous effort to chase back and it was his toe poke which put the guy through. Looking at him, it doesn't look good, but I will see what the doctor says."

McGregor, who would have missed Celtic's trip to St Johnstone on Saturday through suspension anyway, will now await an update from the medical team on how long he will face out. It comes at a hugely inconvenient time for his side, though, who have a run of 11 games in just less than a month before the World Cup break.

With Postecoglou confirming it's a knee problem, it means his injury will fall into one of three broad medical categories: Grade 1, Grade 2, or Grade 3. And Record Sport looks at what this could mean.

Commonly known as a ligament strain, a Grade 1 injury (often a type of contact injury) wouldn't be any cause for serious, long-term concern. It's one of the most common injuries in professional football and rarely requires surgery or any other corrective measures - just a few weeks rest and some ice on the