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The centre-back has been linked with a move to the Premier League, with Chelsea reportedly keen on the 25-year-old.

The Daily Mirror say Blues boss Antonio Conte is plotting a renewed bid this week of around £40m.

The fee would be a slight increase from their previous bid, which Sky Italia claimed was £38m.

However, Italian outlet Gazetta Dello Sport say Koulibaly is close to signing an extended deal with Napoli.

The Italian giants are willing to increase his wages and are desperate to keep him in Serie A.

Napoli are under no pressure to sell their star defender, following the £75m sale of Argentinian hitman Gonzalo Higuain to Juventus.

(Image: GETTY)

Koulibaly had an impressive campaign in Italy last season.

He made 33 appearances as his side finished runners-up to Juventus in Serie A.