The Red Devils had a scout who was in Porto Alegre last week to run a check on Gustavo Nunes.
The young Brazilian, nicknamed Gustavinho, is wanted by a host of top European clubs.
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Per The Mail, the 18-year-old did impress during a half against Huachipato in the Copa Libertadores.
He played in a 2-0 loss for Gremio, coming onto the field in the second half of the contest.
United are hoping to sign more South American players for lower price tags in the coming seasons.