Joe Montana had "extremely minor" surgery on his left knee, the quarterback's fifth operation since 1983 and the second on the same knee, but he is expected to fully recover within six weeks.

John McVay, vice president of the San Francisco 49ers, said Montana "went in in the morning, got a scope (arthroscopic surgery), and went home that afternoon. It was not unusual."Montana is expected to recover by the time preseason training camp begins in mid-July in Rocklin.

McVay added that the 30-minute surgery was needed to remove "some little particles" from his knee and that doctors "didn't see any problems."

Montana, who turns 33 on June 11, will miss the team's second mini-camp next week. Team spokesman Jerry Walker said he hadn't been expected to play much anyway as the 49ers focus on whether to keep John Paye or Kevin Sweeney as their No. 3 quarterback. Montana could not be reached for comment.