Gill leads Crompton tributes
Crompton made 212 appearances for the Red Devils and was part of the team that won the 1948 FA Cup and league title in 1952.
"I have known Jack for many years and was always struck by his humility," said Gill, who stepped down from his role at United to commit his time to European governing body UEFA, where he is now an executive committee member.
"As a man that achieved so much in the game, he always sought to put much more back.
"His tireless work for the Manchester County FA will be hard to replace and he was great company at reserve matches, which he attended with such regularity, even in the poor health that he had to suffer in the last few years.
"His kindness and good humour distinguished him and the club and football in general will miss him greatly."
After ending his playing career, Crompton took up a coaching role under the guidance of Sir Matt Busby and was part of the Scot's backroom team for the 1968 European Cup final triumph against Benfica at Wembley before eventually becoming reserve team manager.