Washington Commanders quarterback Jayden Daniels will not play Monday night against the Kansas City Chiefs because of a low-grade right hamstring strain he suffered in the team’s loss in Dallas, multiple team sources said.

Marcus Mariota will start in his place and Josh Johnson will serve as the backup quarterback.

Daniels grabbed the back of his right leg after getting strip-sacked early in the third quarter of Washington’s blowout loss to the Cowboys last Sunday. He grimaced in pain as athletic trainers rushed to his side, then eventually limped off the field and into the medical tent.

When he emerged, he turned to the crowd to give his mother a thumbs up, and headed to the locker room for the remainder of the game.

An MRI taken in northern Virginia on Monday showed no “significant” injury to his right hamstring, according to Washington coach Dan Quinn, a positive turn after it appeared Daniels may have suffered a long-term injury.

But Quinn wasn’t sure about Daniels’ status for Week 8, saying only that he’d have a better sense of his availability later in the week.

The game will be Daniels’ third missed start this season because of injuries; he was out for Weeks 3 and 4 because of a left knee sprain. He returned in Week 5 and has worn a brace on his knee since the injury.

“I thought there were definitely steps forward from the time that he missed going into the game — when to throw away, when to stay alive,” Quinn said Monday. “And so, me seeing that improvement already, I’m pleased with that. Using his legs is part of his game, but remaining a passer before getting outside the pocket to run, that’s something that we’re going to continue to work on for sure.”

Monday’s game will be the first time Mariota has started opposite Patrick Mahomes; his two starts against the Chiefs, in the 2016 regular season and 2018 postseason, were either before Mahomes was drafted or during his rookie season, when Alex Smith was Kansas City’s starter.

Mariota went 1-1 as the starter during Daniels’ two-game absence, guiding the Commanders to a dominant win over the Raiders and a loss on the road to the Falcons. He was 4-f0r-10 for 63 yards, with one interception (it was returned 68 yards for a touchdown) and a 22.1 passer rating when he took over in relief in the second half in Dallas.

“He’s been battling all year,” Mariota said postgame about Daniels. “I know that can be very frustrating. Just trying to process all that. For me, just trying to go out there and play. Make a play here and there. Try to bring a spark as much as I could. At the end of the day, it just wasn’t good enough.”

Washington was without its top three receivers in the loss in Dallas — Terry McLaurin (quad), Noah Brown (groin, injured reserve) and Deebo Samuel (heel) — and lost starting defensive end Dorance Armstrong because of a knee injury in the first quarter.

There’s a chance the team gets one, if not both, of its top active receivers back this week. Quinn said in an interview with SiriusXM NFL Radio on Tuesday that McLaurin and Samuel are expected to practice fully this week as they prepare for the Chiefs.

Armstrong was placed on injured reserve on Tuesday and the Commanders re-signed Jalyn Holmes for reinforcement.

Quinn said the injuries are not to blame for Washington’s poor recent play, but they have impacted the team’s personnel and, in turn, how opposing teams attack them. Their meeting at Arrowhead Stadium with the Chiefs, who boast the No. 5 offense in net yards per game and rank in the top five defensively in total yards, passing yards and points allowed, will be one of their toughest tests yet. The Commanders are 1-10 all time against the Chiefs and have never won in Kansas City (0-5).

“It’s a hell of a challenge and sometimes those are good ones too,” Quinn said. “Where it’s, OK, you better have your s— together in order to play like we’re capable of.”

The question now is how long Daniels may be out. There’s plenty of season left, but the team won’t want to rush him back and risk further injury. Plus, its season has veered off course. The Commanders are 3-4 and have the eighth-toughest remaining schedule based on opponents’ winning percentage. After the Chiefs, they’ll host the Seahawks in prime time in Week 9, welcome the Lions in Week 10, then travel to Madrid to play the Dolphins. Following their bye, the Commanders will host the Broncos, Eagles and Cowboys at Northwest Stadium, and take on the Vikings, Giants and Eagles on the road.