After entering training camp as New England’s starting quarterback, Cam Newton didn’t just lose that job on Tuesday — he lost his roster spot, too.

The Patriots cut Newton, the N.F.L.’s most valuable player in 2015, as they began paring their roster to the league-mandated 53 players before Tuesday’s 4 p.m. deadline. The move allows the rookie Mac Jones, who excelled in camp and the preseason, to start in Week 1 against the Miami Dolphins on Sept. 12. Newton’s release was first reported by The Boston Globe.