Per ESPN's Darren Rovell, he joins Bayern Munich defender Jerome Boateng as the agency's only two soccer clients:
Other major names represented by Roc Nation Sports include Kevin Durant of Golden State Warriors and NFL star Dez Bryant.
Lukaku, 24, netted his 16th goal of the 2017-18 Premier League season in United's 2-0 defeat of Bournemouth on Tuesday and produced an apposite celebration:
The Belgium international's profile took a major boost last summer when he completed a £75 million move from Everton to United.
He could be a star at the summer's 2018 FIFA World Cup in Russia, as Belgium have enough quality in their side to go deep at the tournament.