E! News said Gibb remained hospitalized Wednesday. His exact condition and where he had the operation were not reported.
The 62-year-old performer recently said he was in remission from colon cancer that spread to his liver.
Gibb's latest health crisis led him to cancel several upcoming public appearances, however, he is still scheduled to attend the premiere of the London Royal Philharmonic's performance of his classical piece, "The Titanic Requiem," April 10, E! said.
"He is currently recovering in hospital and therefore, for the time being, all existing commitments prior to the 'Titanic Requiem' concert, have had to be canceled," his publicist said.