Dallas Cowboys quarterback Dak Prescott is expected to miss several weeks with a hamstring injury, a source told ESPN’s Adam Schefter on Monday.

Prescott is seeking a second opinion to confirm treatment options, the source told Schefter.

Cowboys star wide receiver CeeDee Lamb, meanwhile, is dealing with a right AC joint issue with his shoulder and is set to undergo an MRI. Cowboys owner and general manager Jerry Jones said Sunday he is hopeful Lamb can continue to play since he was able to play through it on Sunday.

Prescott suffered his injury after a 5-yard scramble late in the third quarter of Dallas’ loss to the Atlanta Falcons on Sunday. On the next play, cameras caught him grimacing as he threw a wobbling 10-yard pass to Jalen Brooks on the wide side of the field.

“I felt it when I was getting up from the run. I can’t even say that I felt it running,” Prescott said Sunday. “The tackle, maybe something on the tackle. Yeah, I don’t know, but when I was standing up, I felt something actually. Didn’t think it was much. You get tired. It’s a physical game. A lot of times you feel different things and they kind of go away.”

When he got to the top of his dropback, Prescott said he “felt something I’ve never felt. Yeah, it was tough to walk on it at that point.”

He asked the medical staff whether he could make the injury worse if he continued to play and was told he would not be able to protect himself, so he was pulled in favor of Cooper Rush to start the fourth quarter.

Prescott went 18-of-24 for 133 yards with one touchdown before leaving the game. He had a season-high 30 yards rushing, including a 22-yard gain on a second-quarter scoring drive. It was the Cowboys’ longest run of the season, and Prescott entered the game with 24 yards rushing on the season.

Rush went 13-of-25 for 115 yards with a touchdown in relief of Prescott. Before Sunday, Rush played in two games this season in mop-up duty, completing 9 of 14 passes for 52 yards and an interception. But in 2022, he went 4-1 as the Cowboys’ starter after Prescott suffered a broken right thumb in the season opener.

Trey Lance would be Rush’s backup with Prescott sidelined.

Prescott agreed to a four-year, $240 million contract hours before the season opener that made him the highest-paid quarterback in the NFL. Including Sunday, he had started 36 straight games after his thumb injury. He missed 11 games in 2020 because of a dislocation and fracture of his right ankle and missed one game in 2021 with a right calf strain.

Sunday’s loss dropped the Cowboys to 3-5 on the season.