Arsenal could be in the market for a new central defender in the summer with Ben White and Jakub Kiwior both being used as full-backs – and an African Cup of Nations star is firmly on the shortlist. In a title race and sitting top of the Premier League, Mikel Arteta will know that come the summer – whether Arsenal win the League or fall in the final hurdles, the club will need to make more signings. Standing still often backfires even if the squad is nearly perfect. The Gunners look well-stocked all over the pitch but it only takes a couple of players to leave in the summer, and then work need…