Arsene Wenger fumes at Diego Costa's 'unacceptable behaviour'

Arsenal manager Arsene Wenger launched a scathing attack on the dirty tactics of Chelsea striker Diego Costa and labelled referee Mike Dean naive after losing 2-0 at Chelsea, where his side finished with only nine men.

The Gunners saw centre-half Gabriel sent off just before half-time following a series of altercations with Costa after he had man-handled Laurent Koscielny.