Wladimir Klitschko has rescheduled his world heavyweight title showdown with Jean-Marc Mormeck for March 3 in Dusseldorf.
Klitschko had been set to put his WBA, IBF and WBO belts on the line against the Frenchman on Saturday.
However, the Ukrainian had to pull out after undergoing an operation to have a kidney stone removed. The mandatory defence will now go ahead at the ESPIRIT Arena.
"I know that I am the favourite in all my fights but I also know that each opponent is motivated to be in the best shape ever when he fights me," Klitschko said in a statement.
"Mormeck is one of the most experienced fighters I have ever faced. He has had many world title fights, has a very good technique, can take a lot of punches and is very intelligent inside the ring.
"To underestimate him would be a fatal mistake. I am very happy to return to the ESPRIT Arena where I fought against Eddie Chambers. The spectators and the atmosphere for that fight were great and I am sure it will be again this time."
Klitschko beat David Haye for the WBA title in his last outing.
