It was Courtois's first appearance in front of his home fans and they sang his name as he kept a clean sheet in a comfortable 2-0 victory.
He said: "It was a very nice experience and we played a good game. It's very nice to feel welcome from the very start.
"It was already like that when I played here with Atletico so it is a great thing to come here in a Chelsea shirt and I'm very happy. I'm looking forward to the season and getting a lot of wins."
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