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Apple Chief Executive Steve Jobs received a liver transplant about two months ago and is expected to return to the company by the end of June.

Jobs underwent the liver transplant operation at a hospital in Tennessee, according to the Wall Street Journal. He has been on medical leave from Apple since January and when he returns to the company he may initially work part-time.

Steve Jobs

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

Jobs, 54, had previously been diagnosed with a rare form of pancreatic cancer in 2004 and underwent surgery to remove it.

Chief Operating Officer Tim Cook has been managing the company in Jobs' absence and is expected to continue to do so until Jobs returns full-time.

In a January letter to Apple employees, Jobs said doctors had found the cause of his weight loss "a hormone imbalance that has been 'robbing me of the proteins my body needs to be healthy."

"The remedy for this nutritional problem is relatively simple and straightforward, and I've already begun treatment," he said. "But, just like I didn't lose this much weight and body mass in a week or a month, my doctors expect it will take me until late this spring to regain it."

Close to 10 days later, he announced his health issues were "more complex than I originally thought" and he was taking medical leave, putting Cook in charge of operations.

Apple has previously received criticism from some shareholders over what they have called limited disclosure of Job's health problems.