George Groves will face WBO super-middleweight champion Robert Stieglitz in Germany on May 5.
The British and Commonwealth champion, who recently pulled out of a rematch with Kenny Anderson, was made mandatory challenger to the crown last last month.
Posting on Twitter, the 24-year-old said: "Is fighting for the WBO Super Middleweight Championship of the World!!!!!!! ... And your all invited!"
Unbeaten Groves has not fought since November, when he knocked out former British champion Paul Smith inside two rounds.
The title fight, which will take place at the Messehalle in Erfurt, will be the 15th bout of the Hammersmith fighter's career and second in Germany.
