Safety Lamarcus Joyner has officially been ruled out for the Rams' Week 4 matchup against the Cowboys, as he continues to deal with a hamstring issue that has kept him out of practice this week.

Joyner has played a significant role in the secondary this season after transitioning to the free safety position during the offseason. Through three games he has recorded 15 tackles and one interception. Head coach Sean McVay called Joyner "a great competitor," that is "very versatile," and someone that will be missed in Sunday's game.

"The effort, the energy that he plays with snap-in and snap-out, I think that raises the level of play with the guys around him," he said. "He has made plays in the pass game, excellent in coverage and I think he's an excellent player in run support. We're going to miss him a lot in this game, especially with just the playmakers that they do have on the offensive side of the ball."

The former Florida State standout was injured last Thursday and exited the game early, with safety Cody Davis taking his place on field. Unfortunately for the Rams, Davis has a tweak in his quad and did not participate in Friday's practice. He is listed as questionable for Sunday's contest.

In the event that both Joyner and Davis cannot suit up, McVay said the staff "feels good about depth they do have at safety."

"I have a lot of confidence in the depth we have at the safety position for guys to step up," McVay said, "and then at the nickel spot, we've got some corners that can transition in there that have done that throughout the course of their career as well."

"You look at Maurice Alexander, John Johnson is continuing to improve and Blake Countess, so those three guys [will be available,] he continued. "If that's the case, Marqui Christian is available as well, so we'll evaluate that. Lamarcus will be out. We're optimistic about Cody, but he's questionable for the game right now."