Scotland and Glasgow are sweating over the fitness of centre Mark Bennett after the international suffered a shoulder injury last weekend.
The in-form 22-year-old, who has shone for both country and club over the past year, picked up the problem against Racing 92 on Saturday.
And with big Champions Cup games coming up along with Scotland's Six Nations opener against England, Gregor Townsend's update is a worry.
"Mark's injury is obviously a concern in that he went off and we will have to see how he reacts over the next couple of days," he told the Daily Mail.
"We will assess him as he did take a bad knock near the end that forced him to come off. We will know much more about his condition soon."