10 worst signings of the summer, with departing Arsenal & Chelsea defenders

1) David Luiz (Paris Saint-Germain)

There’s surely only one way this signing is going…£50m for David Luiz is perhaps the biggest steal in history for Chelsea as they laugh all the way to the bank at Paris Saint-Germain’s bizarre lack of football knowledge. The Brazilian international is barely a defender and that showed with his wayward displays for his country at this summer’s World Cup, none more so than a terrible performance to allow Germany to cruise to a 7-1 win in the semi-finals.