Buffalo Bills coach Rex Ryan will enlist a familiar face in an attempt to remedy the team's underachieving defensive unit.
Rex Ryan has hired twin brother Rob to a position with the Bills coaching staff, the NFL team announced late Sunday.
Rob will work under defensive coordinator Dennis Thurman as an assistant head coach with a focus on defense.
The two have not coached together since the 1994 and 1995 seasons on the Arizona Cardinals staff under their father, Buddy.
"I'm excited to have Rob join our staff and I think he will be a great asset for our defense. He has a tremendous working knowledge of our schemes and I look forward to his input," said Rex Ryan.
"On a personal note, it's been a number of years since we have worked together and so we are both really looking forward to this opportunity."
Like his brother, Rob is best known for his work with defences during his 18 years in the NFL, though he has not enjoyed as much success as Rex.
The 53-year-old was fired in November from his most recent position as defensive coordinator with the New Orleans Saints, a title he held since 2013.
New Orleans finished the season ranked last in the NFL in scoring defense and 31st in total defense.
The Bills were unexpectedly mediocre on the defensive side of the ball in 2015, Rex Ryan's first season as head coach.
They finished 15th in scoring defense and 19th in total defense, a major reason why the team went 8-8 and missed the play-offs for the 16th consecutive season. A Rex Ryan-coached defense had finished outside the top 10 in total defense only once in his 11 years as a coordinator and head coach.