Redding will need about six weeks to recover from the operation, the Nationals said.
He was 10-11 with a 4.95 ERA in 2008 for the Nationals, who went a majors-worst 59-102. He led the team in victories.
Silva Back In Two Or Three Weeks
Sevilla Squad In Good Shape For Barcelona Test
Nats GM Bowden undergoes skin cancer surgery
Nationals right-hander Redding to have surgery
