Koller hit for sixDortmund striker Jan Koller's knee injury has been confirmed as a cruciate ligament tear, leaving the Czech Republic striker facing a six-month lay-off.
Koller suffered the injury in Borussia Dortmund's 1-1 draw with FSV Mainz on Saturday.
Dortmund coach Bert van Marwijk said: "I'm shocked,
"We're all very sad."
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