Metro reports that United are pondering a move for the 22-year-old as a long-term successor to Patrice Evra.
United boss David Moyes’ attempt to prise away Leighton Baines from Everton is appearing to stall.
Evra’s deal at Old Trafford is set to expire at the end of the season and the defender has been strongly linked with Paris Saint-Germain and Monaco.
Moyes watched Sandro in action in Porto’s 2-0 defeat at Atletico Madrid last week.
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Summer 2016 is set to be a very exciting time for football fans, as this is when the long awaited Euro 2016 tournament kicks off.
Since Guus Hiddink arrived at the helm, Chelsea have improved considerably after a tricky start to the campaign.