Rangers have confirmed striker Kris Boyd suffered a small fracture to his eye socket in their 2-1 Old Firm win over Celtic.
Boyd sustained the injury following an accidental clash of heads with Bhoys midfielder Landry N'Guemo shortly before half-time.
While scans have confirmed the striker is unlikely to require surgery, he did suffer eye damage and has been referred to a specialist.
He is now likely to be rated doubtful for the SPL match against St Johnstone and the visit of Unirea Urziceni in the UEFA Champions League.
Meanwhile, youngster Andrew Little will require six weeks on the sidelines after tweaking his hamstring early on against Celtic.
"The first ball they played from the kick-off was a diagonal one right down my throat," he told the club's official website.
"Zheng Zhi came across and I sprinted to head it and felt a really bad spasm in my hamstring.
"In my head all I wanted to do was get on with the game but I was also thinking, 'did that just happen to me?'.
"It was one of those things were I hoped it was just a bit of cramp. But I had a similar problem six weeks before so I knew what it was."