Zuttah is the new starting center, replacing Gino Gradkowski. The Ravens signed Zuttah to a new five-year, $18 million contract after acquiring him for a 2015 fifth-round draft pick.

"I've heard nothing but good things," Flacco said of Zuttah.

During the final two games of last season, Flacco dealt with a sprained medial collateral ligament in his left knee suffered against the Detroit Lions. The injury clearly affected his mobility, and he had just one touchdown and five interceptions and was sacked six times as the Ravens lost their last two games.

Healthy again, Flacco didn't need to undergo offseason surgery and appears lean and fit.

"It wasn't ideal, but my knee is feeling good," Flacco said. "I don't have any problems with it anymore."

Flacco ideally would like to hold informal throwing sessions with his offensive teammates this offseason, but he said they've been difficult to organize because of some players' family commitments and school schedules as they complete their degree requirements.

The Ravens' voluntary offseason training program starts April 21 at their training complex. That's likely when the bulk of any on-field offseason work will commence.

"We'll see what we can do, but it's tough with everybody," Flacco said. "We're always constantly talking about it. We're going to be back in the facility in two weeks. Obviously, we'll be getting together then.

"The other thing is it's a new offense. None of us really knows exactly what's going on with how to run a lot of things. It will be nice to get some direction from some of the coaches."