The Los Angeles Rams have placed wide receiver Puka Nacua on the injured list with a right knee injury, head coach Sean McVay said Monday.

Nacua will be out for at least four weeks before he is available again.

The sophomore receiver was injured during the Rams’ 26-20 overtime loss to the Detroit Lions on Sunday. Nacua left the game after making a catch in the second quarter and limped off the field. He returned briefly before being sidelined for good and did not appear in the second half.

McVay said Monday that the injury is a right PCL sprain, an aggravation of an injury Nacua suffered during the offseason, ESPN reported.

Nacua, 23, caught four passes for 35 yards before leaving Sunday’s game.

In his rookie season, he became a favorite target for Rams quarterback Matthew Stafford, catching 105 passes for 1,486 yards — both NFL rookie records — and six touchdowns. In Los Angeles’ playoff loss to the Lions, he recorded 181 yards receiving — also an NFL rookie record — on nine catches, scoring a touchdown.

Nacua joins three offensive linemen and defensive back Cobie Durant on the Rams’ injury report after Week 1.

Los Angeles plays the Arizona Cardinals in week 2.