Celtic boss Ronny Deila has confirmed that Erik Sviatchenko faces a fight to be fit in time for the Scottish Cup semi-final against Rangers.
The Denmark defender will miss Saturday's Premiership match against Motherwell because of a thigh injury.
"He is out for tomorrow, but there is the opportunity for next weekend," said manager Ronny Deila.
"It is a thigh injury, so it could be some days, five to seven days or a little bit more. It is hard to say."
But Deila still retains some hope that the 24-year-old centre-half will be fit enough to face Celtic's city neighbours at Hampden.
"He is young and healing quick, so hopefully he will be ready very quick," he said.
Deila also said he had no worries over the form or fitness of Leigh Griffiths, the Scotland striker who has now gone three games for Celtic without a goal.
"He is not tired, that is for sure," added the Norwegian. "He is ready."
"He gets good chances all the time. That is the most important thing.
"He is vital for us and we know what a good finisher he is.
"It is just small details and he will be back on track again."