Rangers forward Steven Naismith is doubtful for Wednesday's trip to St Johnstone due to a hamstring injury, but it is too early to say about his Old Firm chances.
The Scot limped out of Boxing Day's emphatic 4-1 win over Motherwell shortly before half-time and is now set for tests on the extent of the damage on Monday.
Manager Walter Smith has concerns about Naismith's availability for the meeting with St Johnstone, but he did not want to speculate regarding the 24-year-old's availability for next week's Old Firm derby against Celtic.
Smith said: "He just felt his hamstring. I think it was coming from the base of his back so we will just have to wait and see how it is but I don't think it's too bad.
"We will know better tomorrow. I would say he would certainly be doubtful for Wednesday's game but any further than that, I'm not sure."
Rangers' victory over Motherwell was their first in the SPL at Fir Park in almost four years and it allowed the Scottish champions to remain in pole position in the title race.
Steven Saunders netted an own goal and Kenny Miller grabbed a double but it was Vladimir Weiss who stole the show after also getting his name on the scoresheet, while Motherwell's only response came through John Sutton.