Manchester United are prepared to splash £90m to sign Napoli centre-back Kalidou Koulibaly in the summer, according to The Sun.
The Red Devils reportedly had their top scout to watch the Senegal international in action against Fiorentina at the Artemio Franchi Stadium last Saturday.
The planned swoop would make Koulibaly the world most expensive defender after Liverpool's £75m star Virgil van Dijk.
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