The injury to Dak Prescott’s right hamstring is more serious than first believe and the Dallas Cowboys quarterback might need to undergo surgery, multiple media outlets reported Wednesday.According to the reports, Prescott has a partial avulsion of the hamstring tendon, meaning it tore off the bone.The Cowboys have yet to place Prescott on injured reserve, which would require him to miss at least four weeks. However, the new diagnosis implies an absence longer than a month.Prescott got hurt while scrambling during the third quarter of Dallas’ 27-21 road loss to the Atlanta Falcons on Sunday. Cooper Rush took over at quarterback, and he will be the starter during Prescott’s absence, backed up by Trey Lance.The Cowboys, who have lost three games in a row to slip to 3-5, play host to the Philadelphia Eagles (6-2) on Sunday.Prescott, 31, owns the NFL’s richest contract, with a guarantee of $230 million in a deal that runs through 2030. In nine years as the Cowboys’ starting quarterback, he has a 76-46 regular-season record but a 2-5 postseason record, having never guided Dallas to a conference final.