Chicago ? Cardinal Francis George, hospitalized since cancer surgery more than a week ago, was back in intensive care Sunday because of internal bleeding, the Archdiocese of Chicago said.

Evidence of bleeding, discovered Saturday by doctors at Loyola University Medical Center in Maywood, was a “known but infrequent complication” after surgery to remove a cancerous bladder, officials said.

George, 69, celebrated Mass in his room Sunday and should still recover fully, although the setback means he will stay in the hospital longer than originally expected, the archdiocese said.

George is the spiritual leader of the Chicago area’s 2.3 million Roman Catholics.