Vitali Klitschko will put his WBC heavyweight title on the line against Germany's Manuel Charr in Moscow on September 8.
The bout could potentially be Klitschko's last with the 40-year-old Ukrainian preparing to stand in his country's elections on October 28.
Klitschko has hinted that he may continue his career in the ring, but recently stated: "I will make my decision after the election."
Little-known Charr has a perfect professional record of 21 wins from 21 fights with 11 of those coming inside the distance.
However, the Beirut-born 27-year-old is ranked only seventh on the WBC's heavyweight contender list and is not expected to trouble Klitschko.
Charr has other ideas though and insists he is capable of springing a huge surprise against the veteran Ukrainian.
"Many think I will come to lose but I am coming to win. I will shock Vitali and the boxing world," said the German.