The Mirror says United expressed an interest in Magno during the final few weeks of the transfer window.
It is claimed United weighed up a possible £13.5m bid for the 18-year-old Brazilian before ending their pursuit.
Magno was said to be keen on a move to England, but United instead signed exciting Uruguayan youngster Facundo Pellistri from Penarol.
Magno has been one of Vasco da Gama's standout performers since breaking into the Brazilian side's first team in 2019.
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