Both Sherman and Coyle are friends of new head coach Joe Philbin's, so their hiring makes perfect sense.
In fact, it was Sherman who hired Philbin as an assistant in Green Bay to start his NFL coaching career back in 1993.
Sherman spent last season as head coach at Texas A&M University before he was fired in December after completing a 6-6 regular season.
Sherman spent four season as head coach at Texas A&M, following a two-year stint with the Houston Texans, first as assistant head coach in 2006 and then as offensive coordinator in 2007.
Sherman also was offensive coordinator with the Seattle Seahawks in 1999 before he became head coach of the Packers in 2000.
In six seasons in Green Bay, Sherman compiled a 57-39 regular season record and made the playoffs four times. The Packers, in fact, joined the Philadelphia Eagles as the only teams in the league to make the playoffs every year between 2001 and 2004.
The 57-year-old Sherman, a native of Norwood, Mass., succeeds Brian Daboll, who ended up serving only one year with the Dolphins.
According to reports, Daboll is a candidate to surface in Kansas City, where Romeo Crennel was hired as head coach after ending last season leading the team on an interim basis.
As for Coyle, he has spent the last 11 seasons with the Bengals, the last nine as DB coach.
Cincinnati was his first stop as an NFL assistant, but he served as defensive coordinator in five different places in college — the U.S. Merchant Marine Academy (1981), Holy Cross (1986-90), Syracuse (1991-93), Maryland (1994-96) and Fresno State (1997-2000).
Coyle, who turned 56 on Jan. 14, is a native of Staten Island, N.Y.
He replaces Mike Nolan, who left a couple of weeks ago to become the defensive coordinator with the Atlanta Falcons after serving for the Dolphins for two seasons.