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The Hannover midfielder has suffered a possible ACL tear.
Hannover 96 may have defeated Nürnberg 4-1 on Wednesday, but they may have lost Leon Andreasen for an extended period of time. The midfielder injured his knee at the beginning of the match and was substituted after only 10 minutes.
Andreasen, 29, has been in fine form for Hannover so far this season with six goals in all competitions, and the potential injury would be a major setback to his recovery effort. The Danish international suffered a groin injury in April 2010 and spent the next 28 months trying to comeback. After seven different operations, Andreasen finally returned to the pitch in August of this year. He also made an appearance for Denmark during September's World Cup Qualifiers.
The club has released a statement via their official Twitter account stating that Andreasen would have an MRI completed on Thursday. Speculation is already running rampant that he has suffered a torn ACL.