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Manchester City paid a British record fee for a defender of close to £42m for Eliaquim Mangala, a leaked document has confirmed.

City originally claimed the deal was worth £32m - but admitted later the cost had spiralled due to the player's complicated ownership agreement.

According to the document, which appeared online on Wednesday, Porto only owned 56.67 percent of Mangala's economic rights.

The remainder was split between The Doyen Sports Investment Limited, who owned 33.33 percent, with another 10 percent belonging to an Austrian marketing company.

City had to pay close to £24m for Porto's share alone, meaning the remainder of the deal took the total to £41.4m.

The club haven't commented on the emergence of the document.

With Mangala still struggling for consistency since his switch 18 months ago, his future remains in doubt.

There were suggestions the defender was offered to Valencia on a two-year loan deal as part of the agreement to bring Nicolas Otamendi to the Etihad in August - a move the player rejected.

Should City try to offload him this summer, they would be unlikely to recoup anywhere near the fee they paid for him.