Royce Lewis, considered the Minnesota Twins' top prospect, has a torn ACL in his right knee that will sideline him for the 2021 season.

Twins president of baseball operations Derek Falvey said Lewis was diagnosed with the injury during physical exams upon reporting to spring training. The 21-year-old, the first overall pick in the 2017 amateur draft, will have reconstructive surgery Friday in Minnesota.

Lewis told the team he first noticed discomfort in the knee after lateral running drills this month as part of his training regimen.