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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Since Guus Hiddink arrived at the helm, Chelsea have improved considerably after a tricky start to the campaign.
Newcastle United are staring down the barrel of relegation to the Championship for the second time in the past eight years.