Sexton succeeded Tommy Docherty as Manchester United’s manager in the summer of 1977 after previously being in charge at Leyton Orient, Chelsea and Queens Park Rangers. His reign at Stamford Bridge yielded two trophies - the 1970 FA Cup (after beating Leeds United in a replayed final at Old Trafford) and the European Cup Winners' Cup a year later.
He then went agonisingly close to taking Queens Park Rangers to the Football League championship in season 1975/76 when his team were pushed into runners-up spot just one point behind champions Liverpool.
A deep-thinking football man and consummate tactician, Sexton could be described as an 'eat, drink and sleep football' manager and he looked the perfect candidate for the Old Trafford hot seat. However, his four-year tenure failed to bring the success craved by the club and the fans, as he marginally missed out on winning some major silverware. He guided United to the FA Cup final in 1979, only for Arsenal to win it dramatically 3-2, and then, just as happened at QPR, his team finished runners-up to Liverpool in the title race, in 1979/80.
Although many United fans were of the opinion that Sexton's team lacked flair and that little touch of attacking flamboyance which had come to be expected from any selection wearing the famous red shirts, they were nevertheless shocked when he was dismissed at the close of the 1980/81 season following seven successive wins. It was an impressive haul of points to conclude the season with, but it was felt that the team’s performances and ability to excite the supporters