Liverpool's Emile Heskey may be out for three weeks after damaging a hamstring in the FA Cup win against Newcastle.
Heskey faces a spell on the sidelines
He is out of Saturday's derby with Everton and is a doubt for England's friendly in Portugal on 18 February.
Liverpool manager Gerard Houllier said: "Emile suffered a slight pull to his hamstring and he will miss the derby."
Houllier, who faces a striker shortage, said: "I think he will be out for two to three weeks at least. We will just see how he responds to treatment."
Milan Baros has not yet played a game after five months out with a broken leg, while teenager Florent Sinama-Pongolle is another week away from a comeback after a groin injury.
Vladmir Smicer is still struggling with an Achilles tendon problem while El-Hadji Diouf is on African Nations Cup duty with Senegal.
Heskey's injury also wrecks the prospect of a renewed late transfer move from Middlesbrough, who were willing to pay £5m to take the striker to The Riverside.
Liverpool boss Houllier, who is committed to a £14m outlay to bring Auxerre's Djibril Cisse to Anfield in the summer, insisted the time was not right to sell the 26-year-old.