Sergio Aguero’s two-footed butt stamp on David Luiz: How did Kun get away with this!

Towards the end of an absorbing FA Cup semi-final between Manchester City and Chelsea, Sergio Aguero showed off his darker side with a shocking assault on David Luiz.

On ITV, co-commentator Andy Townsend described the incident as between Argentina (Aguero) and Brazil (Luiz) but surely the Manchester City striker would not be so petty at the end of an important cup match.

Much maligned referee Chris Foy did not even show a card to Aguero who may well come in for some retrospective punishment by the FA this week.

A truly shocking challenge from Aguero and one that may well marr yet another win for Manchester City at the new Wembley.