Baltimore Ravens defensive coordinator Dean Pees, one of the league's top defensive minds, is expected to retire after this season, league sources told ESPN's Adam Schefter.

Pees, 68, has coached in Baltimore since 2010, and before that he was the New England Patriots' defensive coordinator from 2006 to 2009. In that time, Pees developed a reputation for being able to adjust his defenses to the game, creating exotic looks for opposing offenses and being able to work with players.

Pees has not told Ravens players of his intentions yet, but his plan is to leave the game after this season, sources said.