Reading striker Kevin Doyle will have a scan on a hamstring injury to determine how long he will be on the sidelines.
The 23-year-old, who has scored 10 goals this term, sustained the injury in his side's 1-1 draw at Everton.
Reading assistant coach Kevin Dillon said: "At first we thought he had done something to his ankle or knee. It could be bad. How bad we're not sure.
"But he hasn't missed a day's training in about two years so he will probably come back quicker than most."
Doyle is equal third in the Premiership scoring charts, with Arsenal's Robin van Persie and Yakubu of Middlesbrough, and the trio are behind Didier Drogba and Cristiano Ronaldo.
Chelsea striker Drogba has hit the back of the net 14 times in the league this term, while Ronaldo is on 13 goals.
Goalkeeper Marcus Hahnemann added: "Kevin is a big part of our team so hopefully we can get him back soon."