Dean Pees began having second thoughts about retirement two weeks after turning down a contract extension in Baltimore.

“I really started second-guessing myself a little bit: Is this really what I wanted to do? . . . Did I really do the right thing?” Pees said Wednesday, via Jim Wyatt of the team website.

Then, Mike Vrabel called after taking the Titans’ head coaching job.

Before becoming the Ravens’ defensive coordinator, Pees spent six seasons with the Patriots. New England hired Pees initially as its linebackers coach before promoting him to defensive coordinator. He coached Vrabel with the Patriots.

“He wouldn’t have hired me if I didn’t have the same philosophy that he had,” Pees said.

Pees’ defenses have ranked in the top 10 in yards allowed in six of the 10 seasons he has served as a coordinator.