12. Calum Chambers – Southampton to Arsenal, £11m
Having payed an initial £11m (with £5m more to come) Arsene Wenger probably didm;t expect that he’d have to rely on the youngster so much early on. However, an injury to Mathieu Debuchy forced Wenger to move the teenage star over onto the right where he was horribly exposed. Has seldom been used since.
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