Tomas Rosicky has been ruled out of the remainder of the season and is now a serious doubt for Euro 2008.
The Czech Republic international has not played since January with a knee injury and the latest diagnosis means he will sit out the rest of the season.
Perhaps more worrying for Rosicky is that the injury is threatening his participation at this summer’s Euro 2008 finals.
“It is possible that the problem could fade away in two weeks, but it could also last for another three months,” he told Sport.
“Since he has already been out for two months, we are in a tricky situation.
“Karel (Bruckner, Czech manager) is also very worried about it. Tomas is a big player for us and he would be a big loss.
“He can run and jog now, but when he does it for a prolonged period of time it begins to hurt him.
“He would be afraid of sprinting at the moment and as such he is yet to resume full training. We are not prepared to risk him ahead of Euro 2008.
“He is already resigned to missing the rest of the Premier League season, so his priority now is the European Championships.”
Deputy chairman of the Czech football federation (CMFS) Vlastimil Kostal is also concerned that even if Rosicky does recover in time he will not be fit enough for the finals.
“If I am being honest I am worried that he will not be fit enough for Euro 2008,” he said.
“From the point of view that he will not have done enough training, it is not certain that he would be well prepared.”