Man Utd Transfers - 5 Centre-Back Alternatives To Mats Hummels

4. Eliaquim Mangala

Eliaquim Mangala is another long-term target of United's and has been linked with a move to Old Trafford during the eras of Sir Alex Ferguson and David Moyes. Moyes flew out to Lisbon to watch the defender play for Porto in the Portugal Cup semi-final against Benfica earlier this year and is thought to have watched the centre-back play on three separate occasions. However, Mangala's recent form hasn't gone unchecked, with a host of other top sides, including City and Chelsea, also interested. Mangala has been a key member of Porto's squad over the last few years and a linchpin of their defence, helping them win back-to-back Primeira Liga titles in 2011€“12 and 2012€“13. As such the powerful, 6'2" defender has a £37.8 million buy-out clause in his contract, a fee United have balked at, while free-spending Chelsea and City are considered favourites to land the France international.