The Guardian reports that United are ready to make a move for the 22-year-old in the January transfer window.
United boss David Moyes sees the young defender as the perfect long-term replacement for either Rio Ferdinand or Nemanja Vidic.
Mangala joined Porto from Standard Liege in 2011 for €6.5million.
United face competition from the likes of Chelsea, Manchester City, Monaco and Paris Saint-Germain in the race to sign the defender, who has a €45million buyout clause in his contract.
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The start of the 2017-18 Premier League season is just around the corner and is shaping up to be one of the most competitive yet.
As always it is the so called “big clubs” that have splashed the most cash in the transfer window so far this summer. Manchester United or City? Arsenal or Tottenham? Who are the winners and losers of the transfer window so far?