A resolution was reached Thursday after a series of meetings between the coaching staff and front office.
A person informed of the decision has told NFL Media Insider Ian Rapoport that Gilbride plans to announce his retirement Thursday. The team's official website announced Gilbride's retirement shortly thereafter.
Earlier this week, Mara acknowledged that the organization "obviously thinks very highly of him."
Now 62, Gilbride first hit the radar of NFL fans when Oilers defensive coordinator Buddy Ryan took a swing at him in the middle of a game -- as highlighted in NFL Network's "A Football Life: Houston '93."
In addition to a head coaching stint with the San Diego Chargers in 1997 to 1998, Gilbride has coordinated the offenses of the Giants, Oilers, Jacksonville Jaguars, Pittsburgh Steelers and Buffalo Bills since entering the NFL in 1990.
He deserves ever-lasting credit for earning a pair of Super Bowl rings with Eli Manning, but it's time for a fresh voice in the quarterback's ear. Manning has clearly regressed since the middle of last season.
If Sullivan's Buccaneers offense is any indication, the Giants will lean more heavily on the ground attack in 2014 if Sullivan gets the job. That has always been a staple of Coughlin's philosophy in the first place.