Borussia Dortmund issued a statement on Saturday confirmed that the testicular tumor removed from striker Sébastien Haller was indeed malignant, meaning that the 28-year-old will have to undergo chemotherapy.

"Sebastien will now receive the best possible treatment," Kehl noted in a statement, "Chances for recovery are very good. We wish him and his family a lot of strength and send optimistic thoughts to him during this difficult time."