Faulk made the decision, confirmed by his agency, despite playing in only one game this past season because of a knee injury.
Before the injury, which he suffered at practice a couple of days after LSU's season-opening win over North Texas, Faulk had been considered likely to turn pro at the end of the season.
Rather than return to play as a senior, Faulk pushed the number of departing LSU underclassmen to 10.
LSU also will lose defensive linemen Barkevious Mingo, Sam Montgomery and Bennie Logan, running backs Spencer Ware and Michael Ford, linebacker Kevin Minter, safety Eric Reid, cornerback Tharold Simon and punter Brad Wing.
Faulk's agent, Jeff Guerrirro of Monroe, La.-based ProSource Sports Management, tweeted that Faulk signed with the agency Wednesday afternoon. ProSource director of player personnel Richard Roberts confirmed the signing.