This is What Wenger said about Costa following Mertesacker's red in Arsenal's defeat to Chelsea

Per Mertesacker was judged to be the last man when he challenged the Spain striker on his way through to goal and was promptly shown a red card by referee Mark Clattenburg. Moments later Costa scored the only goal of the game from close range.

Earlier this season at Stamford Bridge, it was centre-back partner Gabriel who was given his marching orders after an altercation with Costa and afterwards Wenger said: "He has got two players sent off this season.

"I am accusing him of nothing but those are the facts. That is part of a striker's game of course, and Costa is very good at that