The News of the World says the Chile international enjoyed an outstanding World Cup campaign to enhance his reputation as one of the most promising young forwards on the planet.
With sources close to the wide man previously suggesting he dreams of playing for the Red Devils, it's likely the United boss will continue monitoring his form in Serie A this season.
"We have looked at Sanchez and he has impressed us," said Ferguson. "As have other players.
"He has had very good games and is an interesting project.
"We have gathered some background, as with other footballers at his level, but nothing more than this - for the moment."