Rangers defender Alan Hutton has undergone a successful operation on the broken leg he suffered during Saturday's 2-1 win over Kilmarnock.
Alan Hutton was playing well in Rangers first team
The 20-year-old is expected to leave hospital on Wednesday but will be out of action for about six months.
Right-back Hutton came off worst after a rather wild first-half challenge on Garry Hay.
Rangers manager Alex McLeish said: "It's a real shame for Alan, who has been so impressive for us this season."
The injury came just as Hutton had established himself again in the Rangers first team.
"We've lost a good young athlete, but now it's up to someone else to come in and do well," said McLeish.
McLeish was happy to get the win that takes Rangers six points clear at the top of the SPL, although Celtic do have two games in hand.
"We needed a bit of inspiration from Prso to get the first goal because Killie were using a very tight formation," said the manager.
"I felt we were pretty comfortable at 2-0 and I never felt at 2-1 as edgy as I might have done last season."