#2 Kalidou Koulibaly (Napoli)
This deal would cost a minimum of € 70million to the Gunners and rivals Manchester United are looking favourites to sign the Senegal international in the summer.
The Gunners should definitely make a move for him as he is the answer to all their defensive woes. While the price may seem a little too much for the gunners, the new Adidas kit deal should cover that up. This season we've already seen what impact a defender like Virgil van Dijk can make, as Liverpool have conceded least goals this season in the Premier League (13).
If Arsenal want to challenge for the title, they should go all in for Koulibaly and outbid any other offers. Landing Koulibaly may sound superficial to many Arsenal fans but the Gunners will likely have a big budget for the next summer transfer window as the departure of Aaron Ramsey and Petr Cech retiring at the end of the season will relive them from their massive wages.