Chelsea man involved in unsavoury incident that saw Gunners reduced to ten men.
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Chelsea overcame Arsenal with a much needed 2-0 win over their London rivals that has helped get their Premier League title defence back on track.
Brazilian born Spanish international Diego Costa was involved in a scuffle with Laurent Koscielny towards the end of the first-half which in turn led to a spat with Arsenal defender Gabriel Paulista.
Both players were initially booked before Gabriel was red carded for appearing to stamp on Costa.