Carolina Panthers wide receiver Kelvin Benjamin will miss the entire 2015 season after tearing his ACL in practice.
Benjamin had 73 catches for 1,008 yards and nine touchdowns in his rookie season in the NFL, but his second year in the league will be spent recovering from a serious knee injury.
During the training session, Benjamin made a cut on a pass route and crumpled to the ground without anyone touching him before grabbing at his knee.
He was treated on the pitch for more than five minutes before being carted off and taken away for a scan, which has since revealed the severity of the problem.
"Obviously, we feel awful for Kelvin," Panthers general manager Dave Gettleman said.
"He's worked tremendously hard to put himself in a position to have a strong year. We're confident he will attack his surgery and rehab with the same determination he has met all challenges before."
The injury leaves Carolina without a true number one receiver, and they will need a big season from rookie Devin Funchess, selected in the first round of the 2015 draft.