#3 Kostas Manolas
The defensive hara-kiri at Arsenal is a never-ending saga which could compete with the likes of The Song of Earth and Fire in terms of its length. It is not like Wenger totally neglected this issue as he signed some centre-backs in the past few years, but none of them really solved their problems.
While Laurent Koscielny has been their best defender, Mertesacker is too slow and needs the proper assistance to function adeptly and the Gabriel Paulista hasn’t shown up yet.
Enter Kostas Manolas.
The Greek defender has been a mainstay in Roma’s defense. His towering presence alone could solve a number of problems for Arsenal. He is also a crunch passer of the ball. However, with Roma selling their best attacking player, Miralem Pjanic, it is unlikely that they would sell their best defender in the same window as well.