Barnsley have confirmed that goalkeeper Heinz Muller will be sidelined for six to nine months after injuring his knee.
The German shot-stopper has damaged his anterior cruciate ligament and also his lateral meniscus.
"The MRI scan was a little cloudy because of all the blood in the area so we are unsure as to whether Heinz has ruptured his cruciate or not.
"Whether it is a total rupture or a partial tear will determine what the surgeon does this week and could potentially effect how long he is out for," Tykes physio Richard Kay told the club's official website.
"Heinz will definitely be out for between six and nine months. That is the best and worse case scenario and a lot of it depends on any complications with his surgery and how well he comes through the rehab programme.
"To be honest we will probably know more and even more specifics after the weekend but it will be a long-term injury.
"Heinz will have an operation in Germany on Thursday and it is looking as though he will be out for between six and nine months. Heinz has decided to undergo the surgery over in Germany because he has his family around him there and he knows the surgeon.
"We have consulted with our specialist here and he has recommended that Heinz sees the surgeon in Germany. He is a world renowned surgeon who works with the top Bundesliga and German players. Heinz is fully comfortable with that.
"Heinz is doing a lot better now and he has got over the initial shock of a sustaining a long term injury. He is focussed and he can see a timescale now that he can work towards."