The Dallas Cowboys WILL re-sign Dak Prescott ... at least, that's according to Drew Pearson, who tells TMZ Sports the QB's new deal will almost certainly be the richest one in NFL history.
Pearson spelled it out loud and clear for us during an interview earlier this week ... saying there's just no way in hell Jerry Jones will let his star signal-caller get away from Dallas after this season.
"Dak ain't going anywhere, OK?" the Hall of Famer says. "Jerry Jones is not going to let Dak Prescott go away.