John McVay, the former 49ers general manager and Giants head coach, died Monday at the age of 91.

McVay spent 22 years with the 49ers organization after coaching the Giants from 1976-78. He also greatly influenced his grandson Sean McVay, now the Super Bowl-winning coach of the Rams.

John McVay was with the 49ers organization from 1979-2003 and worked in a variety of roles in the front office. He arrived in San Francisco with Hall of Fame head coach Bill Walsh and helped mold five Super Bowl winning teams. San Francisco renamed its draft room after McVay in 2016, and had previously inducted him into the team’s Hall of Fame in 2013.

“This is a very sad day for our organization and the entire football community. John McVay was a driving force in constructing teams for our five Super Bowl titles,” the 49ers said in statement. “Most importantly, John was a Hall of Fame person who built genuine and sincere relationships with front office staff, coaches and players. John’s commitment and contributions to the 49ers created the standard and tradition we strive to carry on today. Our thoughts and prayers are with the McVay family.”

McVay led the Giants to a 14-23 record during his tenure and was at the helm for one of the franchise’s most infamous games when instead of taking a knee, a late fumble by Joe Pisarcik was scooped by the Eagles’ Herman Edwards and returned for a game-winning touchdown. Philadelphia’s 19-17 win on Nov. 19, 1978 went on to be known as the “Miracle at the Meadowlands.”

“John is an outstanding executive and a class act,” the Giants co-owner John Mara said in a statement. “He was a Hall of Famer in every regard, professionally and especially as a person.”

McVay was born on January 5, 1931 in Bellaire Ohio. Before his days in San Francisco, he was a product of the famous high school football town of Massillon, Ohio, where he was an All-Ohio center. McVay was later elected to the prestigious Massillon Hall of Fame in 1994. He also coaches high school football and was the head coach at Dayton and Memphis Southern of the World Football League before joined the Giants as an assistant in 1976,

He was also incredibly proud of the coach his grandson, Sean McVay, turned into. Before the Rams were defeated by the Patriots in Super Bowl LIII, John McVay told The Post’s Steve Serby that it’s a pleasure to see Sean work.

“As I watch him — I wish we just had a camera on him so I could not see anything else — he’s one of those head coaches who coaches everything,” John McVay said. “A lot of guys say, ‘OK I’m just gonna concentrate on offense, or concentrate on defense,’ but he’s doing all sides of it. He’s full of energy. He’s a workaholic is what he is.”

In addition to creating his own 49ers legacy John McVay leaves behind a football family tree that continues to impact the NFL.

“John was such an instrumental influence on Sean and his leadership qualities permeate our entire organization through the relationship he had with his grandson,” the Rams said in a statement. “John’s legacy will live on forever and the marks he left on his family, our league, and our game will never be forgotten.”