The striker returned for his club at the weekend, coming on in the second half to win a penalty against Manchester City.
He had missed two games in the week leading up to that clash, against Bournemouth and Juventus.
Lukaku picked up a muscle injury during training earlier this month, the latest setback in a season that has seen his form drop drastically. He hasn’t scored for United since September, though he has scored four goals for Belgium to lead them to the top of their UEFA Nations League group.
Belgium face Switzerland on Sunday, with Lukaku’s availability for that game still in doubt.
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