12) Jean Makoun (Lyon to Aston Villa – £6.2m – 2011)

Jean Makoun

The Cameroon international was sent off in just his fourth match for Villa, and he only made eight appearances in total for the Midlands club.

After just six months, Makoun was loaned out to Olympiakos before leaving for Rennes on a permanent basis for an undisclosed fee, which was reportedly around £2.5m.