Bruno Fernandes laid plaudits on Amad Diallo, after the winger scored a 90th-minute winner to steal the spoils in Sunday's game against Man City.
Ruben Amorim led his side to a 2-1 win in his inaugural Manchester derby, aided by two late goals from Fernandes and Diallo.
The United captain scored two minutes before his team-mate, wrong-footing Ederson to convert from the penalty spot.
Fernandes hailed Diallo's 'unstoppable' form, as the Ivorian has now scored two goals and provided six assists in the Premier League this season.