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1. Kalidou Koulibaly
The Senegal international, who was an integral part of Maurizio Sarri's setup at Napoli to put up title challenge last season is surely a player United must sign. Last season, he helped Napoli put up the 3rd best defence in the league despite playing a very attacking system of football under the current Chelsea manager.
Combined with strength and amazing passing, he is surely bound to improve Man United's defence instantly and will be an asset for Mourinho in this United squad.
Despite being relatively older than the previously mentioned defenders, at 27, he is at the prime of his powers and can provide stability for at least the next 5 years at Old Trafford if he does end up moving.
Valued at £54 million, he would be an ideal centre-back who Mourinho desires for success at Manchester United.
