Dallas Cowboys quarterback Dak Prescott will undergo surgery on a hamstring and miss the rest of the season, Cowboys owner and general manager Jerry Jones said Tuesday.

Prescott partially tore a hamstring in the second half of Dallas’ Week 9 loss to the Atlanta Falcons. He will have surgery Wednesday.

“His prognosis is wonderful. It just means we’re not going to have him for the rest of the year,” Jones said during his weekly radio appearance on Dallas station 105.3 The FAN.

Prescott had struggled this season.

In eight games, he threw for 1,978 yards, 11 touchdowns and eight interceptions. His passer rating of 86.0 is a career low, as well as his 1.38-to-1 touchdown-to-interception ratio. His 64.7% completion percentage is also the second-worst mark of his career.

In September, the Cowboys signed Prescott to a four-year, $240 million contract with $231 million guaranteed, the richest contract in NFL history.

Cooper Rush started in place of Prescott during the Cowboys’ 34-6 loss to the Philadelphia Eagles on Sunday. He completed 13 of 23 passes for only 45 yards.

Rush started five games for Dallas in 2022, going 4-1.

The only other quarterback on the Cowboys’ roster is Trey Lance, the No. 3 overall pick in the 2021 draft who was acquired in a trade before last season. Lance has thrown only 108 passes in his career.

Dallas is 3-6 and in third place in the NFC East. The Cowboys have lost four games in a row and have yet to win at home this season — and they have trailed by 25 points at some point in each home game.

Prescott, 31, was a fourth-round pick by Dallas in the 2016 NFL draft. He took over as the starting quarterback that year after starter Tony Romo was injured in the preseason.

Prescott has thrown for 31.437 yards, 213 touchdowns and 82 interceptions in his career, with a 98.1 passer rating.