Charles Kanoff's NFL career began inauspiciously.

The Princeton product took snaps exclusively from the shotgun in college, and his first day at rookie minicamp with the Cardinals was most notable for all the fumbled exchanges under center.

Despite the early turbulence, the undrafted free agent quarterback stuck with it and steadily improved.

While Kanoff didn't make the Cardinals' 53-man roster – it was always going to be a tough proposition with Sam Bradford, Josh Rosen and Mike Glennon ahead of him on the depth chart – he was kept on the practice squad.

There aren't many teams who keep a fourth quarterback around, which says something about how the Cardinals view him.

"He's shown the right to be here," coach Steve Wilks said. "It's very unusual that we have three on the roster and you keep a practice squad quarterback, so he's done a tremendous job in regards to that. We're going to see exactly how it goes."

When Kanoff first arrived, he thought it might be a short stay. It was a big jump from the Ivy League to the NFL, and as an undrafted player, he understood the leash was short.

"Before when I didn't know how I would stack up, I'd be like, 'Well, shoot, I won't have a chance,'" Kanoff said.

Kanoff said there was no breakthrough moment, but over time, he progressively felt more comfortable.

Back in college, he would think periodically about post-football career plans. Now, he's fully invested in carving out an NFL career.

"I have confidence in myself," Kanoff said. "I'm going to do this until they don't let me do it anymore."