5) Matija Nastasic (Manchester City)
Despite not being in the best run of form, Manchester City defender Matija Nastasic could have made a good signing for Arsenal as a replacement for the departing Thomas Vermaelen. The Serbian international looked superb in his first season at the Etihad Stadium, and remains a highly regarded young talent who could improve if given the chance. After falling out of favour at City, this was a chance for Arsenal to sign another solid centre-back, but another target that got away from them again.