Alvaro Morata's emotional response to scoring his first Chelsea goal since the middle of August was welcomed by Maurizio Sarri.
Morata missed an early sitter in Thursday's Europa League tie at home to Vidi, but made amends with the winner in the second half.
It was the first time Morata, whose first season in English football was disrupted by a back injury, has scored since a 3-2 win over Arsenal in the Premier League.
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Having been booked for dissent earlier in the game, Morata appeared to be very emotional after scoring, burying his face in the shoulder of team-mate Willian, who created the goal with a flicked header.