Germany's Sami Khedira is set for a lengthy lay-off after suffering a double ligament tear in Friday's 1-1 draw with Italy.
The Real Madrid midfielder picked up the problem in his right knee in a collision with Andrea Pirlo, and was forced from the field after 67 minutes.
Khedira’s involvement in next year’s FIFA World Cup is now in some doubt, though German team doctor Hans-Wilhelm Muller-Wohlfahrt is hopeful the 26-year-old could recover in time.
"Sami has to be treated surgically. We have the hope that he will start the World Cup," Muller-Wohlfahrt told the German Football Association (DFB) website.
And Real confirmed in a statement on their official website that the former Stuttgart man successfully underwent an operation on his anterior cruciate ligament and medial collateral ligament in Augsburg on Saturday.
"The player will stay in Augsburg over the next three weeks to follow a specific recovery plan to properly heal the injured ligaments," the club added.
Germany coach Joachim Low, meanwhile, admitted the injury had come as a "bitter blow" to both Khedira and the Germany squad as a whole.
"He is, on and off the field, a very great fighter and personality," he said.
"He always thinks positive - this will help him, and so I am optimistic that he is, in time for the kick-off of the World Cup in Brazil, fit again.
"We wish him all the best and keep our fingers crossed that the surgery goes well and he can quickly be put into rehab."
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