Vladimir Klitschko will defend his IBF and IBO world heavyweight titles against Ray Austin of the US in Mannheim on March 10.
Klitschko, 30, successfully defended his titles by stopping Calvin Brock in the seventh round of their fight at Madison Square Garden in November last year.
"Ray Austin is an extremely dangerous and uncomfortable opponent," Ukraine's Klitschko said in a statement from the promoters. "He's very big, has a hard punch and I'm not going to underestimate him."