4. Being too frugal
Last summer Wenger found himself under some serious pressure from the club’s fans. So desperate were they to end the club’s title drought they were positive that a few smart signings over the summer would fix the problem and add some much needed diversity to their ranks. However, Wenger placed a comedy bid for Liverpool’s Luis Suarez instead and neglected to strengthen some key areas of the squad. He eventually brought in Mesut Ozil for just over £42m but he ran a close gauntlet before managing to lift the FA Cup in May.