Apple Inc. CEO Steve Jobs, seen here joking about his health at an October 2008 appearance, is said to be aiming to return to work by the end of June. (Paul Sakuma/Associated Press)

Apple Inc. CEO and co-founder Steve Jobs received a liver transplant about two months ago and is recovering well, the Wall Street Journal reported Saturday.

The report, which did not name its sources, said he underwent the procedure in Tennessee in April. Jobs did not respond to a request by the Wall Street Journal for comment.

"Steve continues to look forward to returning at the end of June, and there's nothing further to say," the journal quoted Apple spokeswoman Katie Cotton as saying.

Jobs has been on medical leave since January. At the time, he announced that he would return to work by the end of June, and is expected to stick to that schedule, though he may only work part time initially.

Apple's chief operating officer, Tim Cook, has taken over Jobs's day-to-day responsibilities in the interim.

Jobs, a survivor of a rare form of pancreatic cancer, said Jan. 5 that he had a treatable hormone imbalance and would continue to run Apple. But the following week he went on leave to treat medical issues that were "more complex" than he had believed.

The Journal said in Saturday's editions that the type of cancer Jobs had can metastasize in other organs, according to William Hawkins, a doctor specializing in pancreatic and gastrointestinal surgery at Washington University in St. Louis.

Jobs's health is a concern for investors because of the influence he has had in shaping Apple's products and design choices. Jobs regained control of the company in 1997.

With files from The Associated Press