Los Angeles Rams star receiver Cooper Kupp left practice early Tuesday with a hamstring injury, and the team is not sure how long he could be sidelined.

Kupp’s final play of the day came on a route that he ran into the end zone. He appeared to come up slightly lame after finishing the route and walked over to the training staff before leaving the field.

Rams coach Sean McVay didn’t have any updates on Kupp.

“Obviously we’re much better when he’s here, and we hope he’s going to be OK,” McVay said. “If he’s not, we’ll see what happens, but the practice had to go on.”

McVay saw the play where Kupp appeared to injure himself but had no other details.

“He looked like he came up a little bit in a red zone route, and then I just knew they told me he was out of practice,” he said. “I have no more information than that.”

Kupp, 30, has been one of the league’s best receivers, but his season was cut short last year after he suffered an ankle injury that forced him to miss the Rams’ final eight games. He still finished with 75 receptions for 812 yards and six touchdowns in nine games.

Kupp won the NFL’s triple crown of receiving in 2021, leading the league in catches (145), yards receiving (1,947) and touchdowns (16).