Newton led the team to their first playoff berth in five seasons this season but the team was ousted in the Divisional Round by the San Francisco 49ers.
"He proved it to me," Gettleman said, via ESPN.com."He proved it this year. He flat proved it."
Even though Gettleman gave Newton a vote of confidence, he refused to say if the team would offer Newton a long-term deal or pick up the fifth-year option on his rookie contract.
The team has until May 3 to exercise that option in Newton's contract, which was a four-year deal worth $22 million he signed in 2011.
"I don't talk contracts," Gettleman said. "I can't work in a vacuum where you work year to year. We are cap challenged, and that's not going away anytime soon. In the next month, we are going to thoughtfully look at next year and a three-year projection and five-year projection."