Former CBS newscaster Walter Cronkite (search) underwent a minor medical procedure on his right heel earlier this week and was reportedly doing well.

Cronkite, 88, was given a preliminary skin graft Monday to repair a wound related to surgery on his Achilles tendon three or four years ago, his chief of staff, Marlene Adler, said Thursday. He had injured the tendon playing tennis.

He felt "very well" but was advised to limit his activities for a week, Adler said.

If the procedure is successful, he could undergo a second graft, she said.

Cronkite underwent quadruple coronary bypass surgery in 1997 and had knee replacement surgery in 1996.

He anchored the "CBS Evening News" from 1962 until he retired in 1981.