CBS says the 18-year-old exploded onto the scene with FC Dallas earlier this year, scoring 13 goals in Major League Soccer this season, and is already fully fledged USA international.
Pepi, who is being viewed in his homeland as the US' No.9 for the next decade, has been linked with United and Liverpool for a number of months and a number of European scouts having been to see him in action.
The two Premier League rivals now face an even bigger transfer battle for one of MLS' hottest properties, with Dallas said to be demanding a cool £7.5million to sell their young star, plus potential add-ons.
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