The Los Angeles Rams are fearing that 25-year-old breakout wide receiver Cooper Kupp suffered a torn ACL.

The incident occurred in the second half where Kupp running a route downfield and attempted to cut off his left leg and immediately went down with no contact.

“Yeah, I don’t think it’s very good,” Rams coach Sean McVay told reporters following the game.

In his second season with LA, Kupp was on pace for 1,000 yards receiving. He went down with 35 catches for 527 yards and six touchdowns, averaging 15.1 yards per catch.

Kupp is on his rookie contract that he signed in 2017, which is 4-years, $3,831,760.