Whittaker, 29, confirmed the injury that will hit him on his Instagram account on Thursday afternoon Throw out 2018 and partly write: "I love this game and there is no way out in me!" and then quote Captain America: "I can not give up, I do not know how!"
Veteran Running Back, who has played in 43 games for Carolina for the past four seasons, suffered the injury on Monday in a hands-free on-site practice during Phase 2 of the offseason program, according to the team's website
The Panthers are up to four running backs on their active roster: Christian McCaffrey, Cameron Artis-Payne and new additions CJ Anderson and Elijah Hood. Unrestrained running back Reggie Bonnafon is expected to sign a contract before the team's two-day rookie mini camp begins on Friday
Whittaker, who is primarily used as a substitute, has worn the ball 121 times for 536 yards and caught 47 passes for 397 yards. He scored four touchdowns and also contributed to kickoff returns.