The Belgian forward was previously a client of agent kingpin Mino Raiola – who facilitated his multi-million pound move to Old Trafford.
But the former Chelsea and Everton man decided to leave Raiola in April and has now joined P&P Sports management – Pastorello's agency.
The Italian also boasts a star-studded list of clientele.
He represents Antonio Conte, Patrice Evra and Kevin Prince Boateng, as well as a long-list of Italian players.
That deal means the agency is the second management company Lukaku has joined in a matter of months.
The 25-year-old put pen to paper on a contract with Jay Z and his Roc Nation Sports agency in April in a bid to expand his commercial status.
With the deal, Lukaku became the first Premier League star to sign with the US music king.
Roc Nation Sports agency is an extension of Jay Z's entertainment company, which has musical popstars Shakira and DJ Khaled in its ranks.
Lukaku had a slow start to the season and admitted he was carrying too much muscle after the World Cup.
But things are seemingly on the up for the Belgium international.
He broke his 997 minute Old Trafford goal drought in the Red Devils 4-1 hammering of Fulham on Saturday and now has two goals in his last three matches for Mourinho's men.
He also attended Jesse Lingard's clothing range opening on Sunday with Paul Pogba and Raheem Sterling.
Lukaku and United are next in action against table-toppers Liverpool at Anfield on Sunday.
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