Borussia Dortmund striker Sebastien Haller has gone through with successful surgery to remove a tumour in his testicular region.

The forward was diagnosed with a form of testicular cancer earlier this month, after complaining to the club of pain in the area.

The 28-year-old, who signed from Ajax this summer, now faces at least a few months on the sidelines.

"The operation went very, very well and he is on the right track," sporting director Sebastian Kehl told 1&1.

"He was super stable and incredibly positive and also said to the team: 'Do your job, give everything. Make sure that when I come back we're still in the running.' And the boys will do that too."

He added on Haller:"He will definitely be out for a few months."