Said Williams: "As far as I know, he is full-go for spring training."
Williams said Saturday the Nationals will monitor Harper's knee to see how it reacts. The staff will modify Harper's workout program if it acts up.
Harper was bothered by his left knee for much of last season, especially after two collisions with outfield walls. He played in 118 games and had surgery in October.
Nationals position players are scheduled to report to spring training Tuesday.