The Buffalo News later reported that the surgery, which took place around the Super Bowl, addressed a slight labral hip tear that Watkins suffered during Buffalo's Nov. 30 win over the Cleveland Browns.
Watkins did not miss any of Buffalo's four remaining games. The rookie out of Clemson caught 65 passes for 982 yards and six touchdowns despite also reportedly dealing with hip and groin injuries.
The paper reported that Watkins will not participate in organized team activity that starts in May but will be able to "work out lightly" with the Bills during the offseason and should be prepared for training camp.
In last year's draft, the Bills traded the No. 9 pick and two future draft picks to move up to select Watkins at No. 4.
After quarterback Kyle Orton retired following last season, the Bills acquired Matt Cassel from the Vikings to compete with EJ Manuel for the starting job next season. Buffalo also signed former Ravens backup quarterback Tyrod Taylor.