Cardinals rookie quarterback Phillip Sims is showing coach Bruce Arians why he made a good decision to sign him after a tryout, according to AZCentral.com.

Arians believes Sims can compete for the No. 3 quarterback role with Logan Thomas and Chandler Harnish this offseason.

"He had no problem listening to (the play) and calling it without it being repeated to him two or three times," Arians said. "Most rookies, they'll get the shift and maybe the formation, then they will turn their head around and ask for the play (again) and everything else.

"He was able to get it. His reads were correct. He actually changed a protection once and I was like, 'Whoa, you're up to level five already. These guys can't do that.' And he was very accurate. He got my attention. He's in the mix."