Cam Newton says he views the 2021 season as "put up or shut up" time.
The New England Patriots quarterback admitted that his performance in 2020 was "obviously not good enough."
Newton, who said he will be reporting for training camp July 22 in advance of the team's first practice July 28, was a guest on ESPN Radio's Keyshawn, JWill & Zubin show.
Newton added that having a full offseason in the team's system should benefit him.
"I don't want to get so caught up in promises and things like that, but I can guarantee you that there's been a shift in comfort of knowing more. And I think that's added value in itself," he said.