The Los Angeles Rams' stellar offense appeared to take a setback Sunday when wide receiver Cooper Kupp suffered an apparent knee injury in the first half against the Denver Broncos at Broncos Stadium at Mile High.

On a 12-yard rushing gain, Broncos safety Darian Stewart appeared to grab Kupp's facemask and was called for a horse collar as he brought Kupp down along the Rams' sideline.

However, the injury appeared to be the way Kupp went down, as he suffered a left knee injury along the sideline.

During the game, Fox Sports reported that Kupp needed help walking while in the locker room and listed him as "questionable" to return. ESPN's Adam Schefter later reported that sources said that Kupp would try to return to the game. Kupp later started the second half.

Kupp has been a solid contributor to the Rams offense since joining the team in 2017. The 25-year-old, who plays a complementary receiving role alongside Brandin Cooks and Robert Woods, has 30 receptions this season for 438 yards and five touchdowns after five full games.

As a rookie in 2017, Kupp had 62 reception for 869 yards and five touchdowns.

GettyImages-1052144182
Cooper Kupp was carted off the field in the first half. Justin Edmonds/Getty Images
ESPN+ National Football League