With Jerod Mayo out with a sprained medial collateral ligament in his right knee, the Patriots have made a trade to boost their linebacker depth, acquiring inside linebacker Prescott Burgess from the Baltimore Ravens, according to an NFL source.

The Patriots sent a conditional seventh-round pick to the Ravens for Burgess.

The 6-foot, 3-inch, 247-pound Burgess was a sixth-round draft pick of the Ravens in 2007. He played in eight games as a rookie before being placed on injured reserve with a hip injury. He didn't play last season and was placed on injured reserve prior to the start of the season with a shoulder injury.

This year Burgess, 25, has played in both of Baltimore's first two games and been credited with two tackles, both on special teams.

Burgess was used at inside linebacker by the Ravens during the preseason. However, Baltimore used Burgess at outside linebacker as well last week against San Diego and that's where he played in college at Michigan, where he was a teammate of Pierre Woods.

Update 5:33 p.m.: To make room for Burgess on the 53-man roster the Patriots released center Ryan Wendell.

Defensive coordinator Dean Pees said that inside linebacker Gary Guyton, who has taken over for Mayo in the middle, did a solid job against the Jets on Sunday.

"I thought Gary did a good job of being in there for the first time, playing inside," said Pees. "It's a little bit new but at the same time, he has practiced there and he played there some in the preseason. Overall, I thought he did OK. There are certainly some things he can improve on too to get better. But overall he got the calls in, and ran the defense and I thought he did OK."