The Rangers striker picked up a hamstring injury in the draw with Hamilton on Saturday.
The Swiss international made his Forest debut.
Celtic beat Hearts 2-1 this afternoon with a winning goal from new signing Scott Sinclair.
The young Spanish keeper has recently been linked with a move to White Hart Lane.
Jon Dadi Bodvarsson enjoyed a dream goalscoring debut for Wolves against Rotherham United.
Hamburg, Olympiakos and Stade Rennes are all interested in the striker.
The Turkish side do not want to pay a free for the striker, who is expected to leave Anfield this summer.
Tottenham's Nabil Bentaleb would be a fantastic addition to the Wolves squad.
Nottingham Forest defeated Burton Albion 4-3 in the Championship yesterday.
Jimmy Floyd Hasselbaink's side beat Leeds United 3-0 on Sunday.