Lupul sustained a groin injury and did not return to the ice for the third.
"Sore groin, so I don't know what that means," Maple Leafs coach Randy Carlyle said. "He just said he pulled his groin."
Lupul, 30, missed two games last month with a bruised foot. He has eight goals and seven assists in 22 games this season.
Toronto lost to Columbus, 6-0.
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