FRANKFURT, Germany (AP) — Wladimir Klitschko has torn a bicep in sparring and his Sept. 6 heavyweight title against IBF mandatory challenger Kubrat Pulev has been postponed.

Klitschko's management says the champion will have to miss four weeks of training. A new date for the fight will be announced later. It will likely take place in Hamburg, the original venue. Klitschko was injured at his training camp in Austria.

The fight is likely to be held before the end of the year, according to Klitschko's management.

The statement quotes Klitschko as saying he was "very disappointed" by the postponement because he was "absolutely in top form" and had a "great training camp" behind him. He says he sorry for his opponent, "who has surely prepared as intensely."