Douglas to go under knife
By Mark Kendall
Last Updated: 01/01/70 1:00am
However, the Scotland international is still hoping to line up for The Bhoys in the Scottish Cup final against Dunfermline on May 22 as the operation is scheduled to take place after the end-of-term showpiece.
Douglas has been feeling pain during and after matches and, after seeking advice from an English-based consultant, he has agreed to go under the knife.
Meanwhile, Celtic boss Martin O'Neill has ruled out a shock return to the Cup Final squad for Wales international John Hartson who is making better than expected progress from his back operation, insisting pre-season remains his realistic target.