The Red Devils have sent their talent hunters to South America before making a final decision whether to launch a £30million bid.
Everton is a lightning quick forward who usually plays on the left but can also play on the right or through the middle.
The 22-year-old is the club's top scorer this season with nine in 20 league starts.
And his potential is not going unnoticed with fierce league rivals Manchester City also paying close attention.
Portuguese boss Jose Mourinho will be hoping the likes of Brazilian compatriot Fred would help lure Everton to Old Trafford.
The gaffer is looking to bolster his front line and his arrival could spark Anthony Martial's exit from the club.
Martial, who has been in red-hot form in recent weeks, has a contract expiring at the Old Trafford in the summer and has yet to put pen-to-paper on a new deal.
Alexis Sanchez's future at the Reds is also in increasing doubt having grown discontent with life at Old Trafford.
It is believed United are finally set to cut their losses with the forward and have offered him a move to Real Madrid.
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