Mangala is wanted at Old Trafford by new boss Louis Van Gaal as he seeks to rebuild United after their dismal 2013-14 season.

Chelsea boss Jose Mourinho is also on the lookout for a defender after David Luiz's £50m switch to Paris Saint-Germain.

The 23-year-old fits the bill for both sides, with his stunning performances at the back for Porto catching the eye of the Premier League giants.

Reports in Italy suggest the Portuguese side are demanding around £36m for the French international, who is currently in Brazil at the World Cup.