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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Liverpool have unveiled their new home kit for next season, sticking with the hugely popular retro styling of the current shirt.
The reputation of the Premier League means it is the most popular and one of the most watched leagues in the world.