Werder Bremen midfielder Zlatko Junuzovic is unsure when he will be able to play first-team football again due to a nagging ankle injury.
Junuzovic has been a regular starter for Werder in the Bundesliga so far this season, but is struggling to shake off the problem.
He did not feature in Austria's World Cup qualifier against Germany last Friday and he will also sit out Tuesday's game against the Republic of Ireland.
Reports have claimed that the 25-year-old faces a prolonged spell on the sidelines and Junuzovic does not know when he will be back to full fitness.
"The trouble is down to my ankle joint, but I do not know the real cause yet," Junuzovic told Kreiszeitung Syke newspaper.
"We still have to find this out. It may take some time to get back into contention for a match."