United remain fourth on the table, with one point ahead of Chelsea, which was forced to a 2-2 draw at Stamford Bridge by Leeds United.
Arsenal fans will now focus their attention on the game between Liverpool and second-placed Manchester City on Sunday.
The win also put Chelsea two points ahead of Arsenal.
Manchester City’s recent woes continued on Sunday evening after Pep Guardiola’s side recorded their sixth consecutive defeats in the Premier League.
The result lifted Chelsea to third in the table and ended Brighton’s unbeaten start to the season.
Lookman bagged a hat-trick as Atalanta won its first-ever European trophy last season.
“I’d like to thank all of the City staff, coaches and especially my team-mates because without them this wouldn’t be possible.”
The youngster now becomes the first Chelsea player to win the award since its inception in the 2019/20 season.
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The victory moved Mauricio Pochettino’s Chelsea up to 10th, five points behind United with a game in hand.
