Midfielder Ilkay Gundogan has undergone a successful knee operation, his club Borussia Dortmund announced Friday, with the German international expected to be out of action for several months.

The 25-year-old, who will miss this summer's European championships in France, dislocated his knee cap in training with Dortmund earlier this month.

His current Borussia contract expires in June 2017, but he has been linked to a transfer to Manchester City to work with their incoming manager Pep Guardiola, after Gundogan's agent met City's director of sport Txiki Begiristain.