Chelsea held off a spirited Luton Town fightback to leave Kenilworth Road with three points.
Cole Palmer returned to the visitors’ starting line-up and scored twice, his first coming after pouncing on a blunder by Issa Kabore.
Noni Madueke, another of four changes Mauricio Pochettino made to his first XI, doubled the lead, finishing superbly into the roof of the net after a fine pass from Palmer.
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Palmer then seemingly put the game behind the hosts with a wonderful second to make it 3-0, bamboozling the Luton defence and goalkeeper with dazzling feet to almost walk the ball into the net.
But Luton were not done and late goals from Ross Barkley – a glancing header against his former club – and Elijah Adebayo made it a nervy finish for Chelsea.