Puka Nacua was forced to leave Sunday’s game between the Los Angeles Rams and Detroit Lions due to a knee injury.

The Rams receiver appeared to suffer the injury in the first half. He returned briefly, but left the game to meet with medical trainers. Nakua was able to walk along the sideline, but left the game on the cart.

The Rams announced after halftime that he would not return to the game.

Further details about Nacua’s injury were not initially clear. The Lions led 10-3 at halftime.

Nacua, 23, emerged as one of the biggest surprises of the 2023 season. A rookie fifth-round pick out of BYU, Nacua emerged as the Rams’ top receiver and one of the most productive receivers in the NFL last season. He finished the season with 105 catches for 1,486 yards and six touchdowns, earning Pro Bowl honors.

With Nacua alongside a healthy Cooper Kupp after two injury-riddled seasons, the Rams enter 2024 with one of the NFL’s most promising wide receiver tandems. A long-term injury would be a significant blow to the Rams’ offense as they attempt to contend for their fourth playoff appearance in five seasons.