Lukaku went on to say: "I don't know. You’ll have to ask Chelsea."
The striker also admitted he'd been disappointed to see his team held after conceding a stoppage-time equaliser to Jude Bellingham.
"‘Yeah, this is football at the end of the day," he said. "It’s not over until the referee blows his whistle. You have to continue, this is a team in progress. We did an okay performance today."