The Belgian striker started against Tottenham in the Carabao Cup semi-final first leg on Wednesday.
He had previously been dropped after giving a controversial interview with Sky Sports Italia in which he expressed his unhappiness with his situation at Chelsea.
Speaking after the 2-0 victory, Tuchel said about Lukaku's performance: "Good, absolutely happy, I was pretty sure he was not affected. Even the last days he seemed relaxed, fine with the situation and mentally moved on.
"Romelu can handle pressure and adversity, it was a good performance, he contributed a lot to our defensive set up and had chances."
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