Ravens' Joe Flacco has answered all the injury questions for Marc Trestman

Flacco ready to play Friday after strong camp (0:44)

Adam Schefter examines Joe Flacco's training camp with the Ravens and Flacco announcing he will play in Baltimore's third preseason game. (0:44)

OWINGS MILLS, Md. -- Baltimore Ravens quarterback Joe Flacco will make his preseason debut Saturday, but he doesn't have much to prove to Ravens offensive coordinator Marc Trestman.

By what he's done in training camp, Flacco has answered all of the questions coming off last year's season-ending knee injury.

"He practices at full speed," Trestman said. "He’s made it a point to work in the pocket and getting himself outside of the pocket, throwing on the run and moving around. I think he’s completely confident in his ability to move around and have the mobility in the pocket that he needs and to be able to scramble when necessary."

Flacco has been impressive this summer, from the accuracy on his throws to playing every rep on a surgically repaired left knee. He's one of the few older players on the team who hasn't taken a practice off.

The Ravens have played it cautiously by sitting him in the first two preseason games and starting Ryan Mallett. Saturday's game against the Detroit Lions will be Flacco's first since tearing the anterior cruciate and medial collateral ligaments in his left knee last Nov. 22.

What are the Ravens looking for out of Flacco?

"We just want to keep him safe out there and give him the opportunity to throw the football and do what we want to do during the season, so we’re not going in there with any parameters other than get some good work, get in the red zone and score," Trestman said.