FRISCO, Texas -- Dallas Cowboys quarterback Dak Prescott is dealing with a partial avulsion of his right hamstring, which means part of the tendon has pulled away from the bone, a source confirmed.

Prescott has not been placed on injured reserve yet, and if he is, would miss a minimum of four games, which would keep him out until at least Dec. 9 against the Cincinnati Bengals if the move is made this week. Two sources, however, said Prescott is likely to need a longer recovery period than the four weeks.

NFL Network first reported the nature of Prescott's injury.

Prescott was hurt after a 5-yard scramble late in the third quarter of Sunday's loss to the Atlanta Falcons. On the next play, cameras caught him grimacing as he threw a wobbling 10-yard pass to Jalen Brooks. After the game, he said he had not had that feeling before.

"I felt it when I was getting up from the run. I can't even say that I felt it running," Prescott said. "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."

Prescott had an MRI on Monday, and a source told ESPN's Adam Schefter then that the quarterback would miss several weeks.

In 2022, Cowboys left tackle Tyron Smith suffered a full avulsion of his hamstring in a training camp practice that required surgery. He missed the first 13 games of the season.

The Cowboys will go with Cooper Rush as their starter in Prescott's absence. Rush is 5-1 as Prescott's replacement, including a 4-1 stint in 2022 after Prescott suffered a broken right thumb in the season opener. He has nine touchdown passes and six interceptions with 1,786 yards passing in 30 appearances.

Trey Lance will serve as the backup.

"Cooper's been great in getting Dak ready to play and now Dak, they'll be some role reversal there," coach Mike McCarthy said. "(Rush's) temperament is excellent. I would say he's as even-keeled as an individual, especially a quarterback, that I've had the opportunity to work with. Cerebral. Smart. He gives you the flexibility to continue to play. I think that's what you want in all your quarterbacks. You don't want to get to a spot where you have to change a bunch of things offensively because who's behind center."