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Emery's final match in charge was Thursday's 2-1 Europa League home defeat to German side Eintracht Frankfurt which extended their winless run in all competitions to seven games, the worst streak since February 1992 under George Graham.
On another compelling afternoon in England's top-flight, Arsenal dented Chelsea's increasingly fragile title pursuit with a 2-0 derby win.
Arsenal remain fifth on 41 points while West Ham move up to eighth on 31 points before the rest of the weekend fixtures.
Alvaro Morata's second-half brace was enough for Chelsea, who beat United in last year's final, to move through.
The win was only the second in six games for Arsenal but it moves them within two points of fourth-placed Chelsea.
Substitute Lucas Torreira pulled a goal back for Arsenal in the 85th minute, but by then the damage had been done.
The 24-year-old Ivory Coast international signed a five-year deal and will wear the number 19 shirt at the London club.
Third-placed Tottenham had not drawn any of their previous 28 Premier League games and will be hugely relieved to have ended that remarkable sequence.
Arsenal became only the second team in Europa League history to win a tie after losing the first leg 3-1.
It was United's first league defeat since December 16.
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