Scotland winger Sean Maitland has been ruled out of Saturday's Calcutta Cup clash with England at Murrayfield.
The British and Irish Lion went off injured in the first half of Scotland's opening RBS 6 Nations defeat by Ireland in Dublin on Sunday.
The Scottish Rugby Union's head of medical performance, Paul McGinley, said: "Sean suffered a concussion as well as injury to his right leg (on Sunday).
"He will be subject to further investigation (on Monday) at Spire Murrayfield hospital and will be assessed later by consultant surgeon Graham Lawson.
"We also have a number of injuries at this juncture which will impact on availability to train at the start of this week, but we are optimistic that players will recover in time for the England game."