Europe's top teams are all said to be keeping a close eye on Porto's Eliaquim Mangala.
The 22-year-old Frenchman came close to joining Manchester United's arch-rivals City on deadline day, however the proposed deal fell through at the final hurdle.
The Red Devils will have to spend in the region of £30-40million if they want to beat off competition from the likes of Manchester City for his signature.
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