​Napoli defender Kalidou Koulibaly has been offered to Europe’s top clubs, including Arsenal, ​according to Goal.

No club is yet to match Napoli’s hefty €45m asking fee, but Arsenal are believed to be interested in signing the 25-year-old, while both Everton and Chelsea are also thought to be monitoring the Senegalese international.

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Koulibaly made 33 Serie A appearances for Napoli during the 2015-16 season, picking up 11 yellow cards along the way, helping his side finish second, nine points behind champions Juventus. 

He joined Napoli in 2014 from Racing Genk, having also spent time at French club Metz, and his club form has earned him six international caps for Senegal since making his debut for the national side in 2015.

Arsene Wenger is reportedly keen on bolstering his centre-back contingent, with Per Mertesacker, Laurent Koscielny and Gabriel Paulista all coming under fire during the 2015-16 Premier League season for displaying inconsistent form.

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Koscielny has been given additional time off due to his Euro 2016 commitments, and is reportedly set to miss the beginning of the Premier League, leaving Arsenal shy of centre-backs with just Mertesacker and Gabriel as recognised central defenders. 

Nacho Monreal and Calum Chambers have filled in at centre-back during recent years, although both have looked unconvincing.

Arsenal are hoping to complete the signing of Bolton Wanderers defender Rob Holding over the next week or so, having agreed personal terms with the 20-year-old. The England U21 international would become Arsenal’s third summer signing, after midfielder Granit Xhaka and striker Takuma Asano both moved to North London earlier this summer.