The Saints are hiring Campbell as an assistant head coach/tight ends coach, a source told ESPN.
The Saints also are hiring former Detroit Lions offensive coordinator Joe Lombardi and former Pro Bowl cornerback Aaron Glenn, according to the source.
In a sense, it will be a homecoming for all three of them. Lombardi, who spent seven years as an assistant coach in New Orleans from 2007-13, will return to his former role as quarterbacks coach.
Campbell and Glenn, meanwhile, both finished their playing careers in New Orleans, though Glenn only appeared in four games in 2008 and Campbell never played in a game after landing on injured reserve in 2009.
The connection to Saints coach Sean Payton is obvious with all of them.
Campbell played under Payton with the New York Giants, Dallas Cowboys and Saints during his 10-year career as a tight end, which also included a stint in Detroit. Campbell was used mostly as a blocking specialist, finishing his career with 934 yards and 11 touchdowns.
Payton has described Campbell as "a fantastic guy," "tough and strong" when Campbell became the Dolphins' coach.
Campbell joined the Dolphins as an assistant in 2010, working his way up to the top job after head coach Joe Philbin was fired in October.
Campbell went 5-7 as interim coach. But the Dolphins decided to hire Adam Gase as their new head coach last week, and Campbell was not retained on staff.
Campbell apparently drew quite a bit of interest around the league, though, with the Minnesota Vikings and Cowboys among other teams that reportedly showed interest.
Lombardi, who is the grandson of Vince Lombardi, began his NFL coaching career as an assistant with the Atlanta Falcons in 2006 before joining the Saints' staff in 2007 and eventually being promoted to QB coach. Lombardi was fired less than two years into his job with the Lions, along with two offensive line coaches, after the team got off to a 1-6 start.