ESPN says United have expressed interest in the 17-year-old midfielder, who scored four goals and provided two assists in his breakthrough MLS campaign.
It's said United have been "kicking the tires" for the US Under-17 international, while European rivals Fiorentina have had several offers of around £3million rejected.
SKC's director of scouting Edward Burleson said: “He's a great talent. He is a player who can play safely in Europe. If he wants to make a great career, he has to go to Europe soon. Inter? Yes, I also know about Manchester United."