Celtic have suffered a blow after defender Glenn Loovens picked up a hamstring injury that could rule him out for six weeks.
The Dutch stopper sustained the knock on Tuesday, meaning manager Neil Lennon will need to rejig his side for their weekend trip to Aberdeen.
Celtic travel to Pittodrie on Sunday but Loovens will play no part after a costly training ground collision.
"It was a strange one," commented Lennon. "It was the way he came up off the ground, he got a bit of a collision in training and felt his hamstring go.
"That's the only blow because apart from that we're pleased. It's just the timing of the injury which has gone against us a wee bit."
Meanwhile, Lennon has confirmed that Irishman Darren O'Dea, who spent five months with Ipswich last term, is joining Leeds on loan.
"Darren's chances were limited and I think it's a good move for himself and Leeds," he continued.
"The year there will do him the world of good as the Championship is a very tough league."