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Borussia Dortmund striker Sebastien Haller will be "out for a few months" after having surgery on a testicular tumour.

The Ivory Coast forward, 28, was diagnosed last week during the team's pre-season training camp in Switzerland.

Dortmund sporting director Sebastian Kehl said: "He had a successful operation last week.

"The operation went very, very well and he's on the right track."

Kehl added that treatment plans are still being discussed and a return date had yet to be fixed.

"Sebastien will be out for a few months but once we can be more precise about that we will communicate it."

Haller joined the Bundesliga side from Ajax earlier this month for 31m euros after a short spell at West Ham.