Ten players Arsenal will regret not signing this summer, including Chelsea duo & Man United new-boy

5) Luiz Gustavo (Wolfsburg)

With a recent injury to Mikel Arteta, cover in defensive midfield was urgently needed by Arsenal. With moves for other top targets seemingly falling through, Luiz Gustavo could have been a fine addition for the club at a cost of only £26m due to a release clause in his contract with Wolfsburg. The Brazilian has been linked with the north London giants in the past and there seems little reason for Arsene Wenger not to have revived his interest here.