Cowboys’ Dak Prescott may require season-ending surgery on injured hamstring The Dallas Morning NewsPart of Dak's hammy pulled off bone, source says ESPNCowboys QB Dak Prescott's initial diagnosis says hamstring tendon partially tore off bone NFL.comCowboys get more brutal injury news on Dak Prescott New York Post Cowboys QB Dak Prescott could need season-ending surgery on hamstring, per report Yahoo Sports