Double world heavyweight champion Wladimir Klitschko will put his WBO belt on the line when he faces Tony Thompson in Hamburg on July 12.
The Ukrainian added the strap to his IBF title when he beat Russian Sultan Ibragimov in a thoroughly forgettable bout last February in Madison Square Garden, New York.
Thompson will provide his next test as the mandatory WBO challenger, with the 36-year-old American having a record of 31-1 with 19 wins by way of knockout.
The IBF board have yet to clear the fight as their official challenger is Russian Alexander Povetkin, although they likely to give the all-clear with Klitschko promising to take on Povetkin later in the year.
The 28-year-old is the 2004 Olympic heavyweight champion and is so far unbeaten in his professional career with 15 wins, 11 by stoppage.

Munroe v Maludrottu - Munroe
Munroe - I'm always training
Munroe v Maludrottu
Ring return for Hatton?
Mayweather exclusive
Haye v Valuev
Pacquiao v Cotto
Hatton v NDou
Adam Smith catches up with Floyd Mayweather and thinks he is itching to fight Manny Pacquiao.
While Pac Man may have won big in Vegas, others in the world of sport didn't fair so well at the weekend.
Read what Sky Sports' experts and bloggers have been talking about over the last seven days in sport...