Reading striker Leroy Lita could be out for a month after damaging a leg muscle as he stretched in bed after waking up.
Lita could be out until September
The 22-year-old has been unable to train for the last two days and Royals boss Steve Coppell said: "Leroy is in a great deal of pain.
"It's a point of laughter but a serious business for him because he's going to be out for three or four weeks."
Lita, who scored seven Premier League goals last season, will miss the season opener at Manchester United on Sunday.
"He woke up and stretched while in bed and he has done something to his leg," Coppell added.
"It is not an injury that should be ridiculed or made light of. It looks to be a problem with a nerve. Maybe he has displaced one, but he could hardly walk on Monday and had to sit out training."
Meanwhile, Lita and defender Nicky Shorey are reported to have rejected new contracts with the Royals.
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Both players have two years left on their current deals - and both have been linked with other Premier League clubs.
"There's no rush with either Nicky or Leroy as both have two years left on their present deals," added Coppell.
"We just want to reward them more in line with what they have achieved at the club."
But Lita recently indicated that he would like to stay with Reading.
Speaking at the end of July he said: "I'm happy here. This is an important year for me and the club and I just want to play and be successful."