The Belgian has struggled throughout this season since arriving from Inter Milan in the summer.
But Lukaku bounced back to score both of Chelsea's goals at Stamford Bridge and Tuchel hopes it sparks a purple patch for the 28-year-old.
"Today he delivered," said Tuchel of Lukaku. "Every striker is a very sensitive player.
"I don't know any other strikers who have their confidence if they are on a streak where they don't have to role that they wish for and it's the same for Romelu.
"So you see it immediately, it arrived. The second one was straight away easier because he had his goal and he fought hard for his goal.
"It's like this, they are sensitive because they are decisive and that's why it is super important."
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