Nacho Novo is doubtful for the Old Firm derby at Celtic after limping out of Rangers' 2-0 win over Dundee United in the Clydesdale Bank Premier League.
The striker was forced out of the action shortly before half-time at Ibrox after spraining his ankle. Boss Walter Smith is now bracing himself to be without the Spaniard for up to three weeks - meaning he could miss the visit to the east end of Glasgow on February 15.
"He's got a badly sprained ankle and he will be looking at maybe two or three weeks out with that," said Smith. "They don't think there is anything broken, the initial diagnosis is a bad sprain."
Teenager John Fleck won, and then converted, a penalty late in the second half, before Kyle Lafferty sealed the win for Rangers in injury-time.
Fleck has impressed since making his breakthrough to the first team and Smith had nothing but praise for the 17-year-old for holding his nerve from the penalty spot.
He said: "There was no pecking order as such; the lad was just keen to take the penalty himself.
"All credit to him to have the confidence to do that. He has taken the penalties all through his youth career so he was obviously confident to take that one."
Smith added: "There are two things here. There is our responsibility to try to make sure that we don't over-play a young player but you have to look at him as well if he is keen to play and it doesn't look as though it's affecting him.
"He's got the ability to play, he's been deserving of his starts and he has shown he has the ability to carry on.
"There will be ups and downs, as there is with every young player, but he has shown enough quality in the three or four games he has taken part in to indicate that he is going to be a good player."
Copyright (c) PA Sport 2009, All Rights Reserved.