Back from an ankle injury, Lukaku scored in last night's 1-1 draw with Brighton.
While visibly frustrated afterwards, Tuchel had special words for Lukaku: "I'm surprised what he's doing.
"I don't know how long he can do it. We will try it and then we will see. Nobody knows.
"He was eight weeks out, and when he was trying to come back he caught covid, and then after that training and then playing. That's what we do at the moment."
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