Wladimir Klitschko should be fit to defend his heavyweight titles against France's Jean-Marc Mormeck on Saturday.
The IBF, WBA, IBO and WBO champion has had surgery to remove a kidney stone, his manager said on Sunday.
"The operation went well. If there are no unforeseen complications he'll fight," Bernd Boente said.
Klitschko is due to face Mormeck, 39, in Düsseldorf, Germany, on Saturday night.
"It's a delicate situation but thankfully most of the training has already been done. We'll see how he reacts to the surgery. In the end it's up to Wladimir to decide," Boente said.
"The history of boxing is full of last-minute cancellations, but I hope Wladimir will fight."
Having beaten Britain's David Haye in July to add the WBA belt to his collection, Klitschko is scheduled to appear in his 20th title fight. His record is 56 wins, 49 knockouts and only three defeats.
A pre-fight media conference will be held on Monday.
Klitschko, 35, left his training camp in Going near Kitzbuhel, Austria, on Friday because of renal colic pain and was flown to a hospital in Innsbruck.
The Ukrainian's management official Klaus-Peter Dittrich said afterwards, "Wladimir is receiving medical treatment but the planning and preparation for the fight are going ahead."
Tags: Wladimir Klitschko , Jean-Marc Mormeck , Klitschko-Mormeck , Klitschko vs Mormeck