Manchester United have had a disappointing season but will be looking forward to the summer as Erik ten Hag will be arriving at the club to begin to fix the issues at Old Trafford and improve the squad ahead of next season.
There are many areas of improvement needed at the club and with so many players out of contract including Paul Pogba, Nemanja Matic and Jesse Lingard, there will need to be signings made to add depth and quality all over the pitch.
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One area that is in drastic need of improvement is the defence, which has come under harsh criticism this season due to the consistently awful defensive throughout that have contributed to Man United's failure to compete for trophies this season. As a result, they won't play Champions League football next season after failing to pick up a top-four spot in the Premier League.
With that being said, Ten Hag must take the opportunity to sign defenders this summer and replacing Victor Lindelof with Kalidou Koulibaly would be a huge coup for the new manager and Manchester United.
The Senegalese defender was hailed a "monster" who "eats attackers whole" by football journalist Maxi Angelo, and has now been linked with a move to Old Trafford this summer.
According to Italian news outlet Area Napoli, Man United are now in contact with Koulibaly's representatives to see if they can get a deal done for the centre-back.
When you compare the Napoli defender to Lindelof who was branded "pathetic" by journalist Rob Blanchette, this season there is no doubt that the signing would be a massive upgrade for the Red Devils and Ten Hag in his first season in charge at the club.
According to Squawka, Koulibaly has won more ground duels, more interceptions and completed more take-ons, whilst making more ball recoveries and blocks in two fewer appearances in the Serie A compared to the Swedish defender in Manchester.
If his defensive actions for Napoli weren't enough to impress he has scored three goals and contributed one assist, ranking ninth for the most successful dribbles and has the fourth-highest shot conversion rate in the Serie A this season, proving that he is not only a force in defensive play but is highly effective in attacking too.
When you consider the quality that Koulibaly offers, the new Man United manager must seal the deal to secure the signature of the £40m AFCON winner this summer and by doing so he can finally axe Lindelof from the team.