Real Madrid have reportedly had an £80m bid for centre-back Kalidou Koulibaly rejected by Napoli.
Madrid are believed to be in the market for a new central defender this summer amid suggestions that club captain Sergio Ramos is considering walking away from the Bernabeu ahead of the 2019-20 campaign.
Koulibaly, who arrived in Naples from Genk in the summer of 2014, scored twice in 48 appearances for Napoli during the 2018-19 campaign.
The 27-year-old is believed to have a £110m release clause in his current deal, which Napoli want activated if he is to leave in this summer's transfer window.
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