Conor Gallagher returned to Selhurst Park to haunt Crystal Palace with a stunning late winner to give Graham Potter a controversial first victory as Chelsea boss.
Substitute Gallagher, who impressed on loan at Palace last season, curled home a superb right-footed effort to snatch victory for Chelsea with his first goal for the club.
Pierre-Emerick Aubameyang also scored his first Chelsea goal on his Premier League return after Odsonne Edouard had poked Palace into an early lead.
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