VIDEO: Arsene Wenger believes Diego Costa is to blame for Per Mertesacker’s red card

Once again, Arsene Wenger is unhappy with Diego Costa.

The Arsenal manager saw his team once again fail to beat Chelsea after Costa scored the only goal of the game. But it's a moment just before the goal that was the major talking point, after the Spain international went down after a challenge from Per Mertesacker. The German was shown a red card, but replays suggest that there might not have been any contact between the two. During his post-match interview, Wenger said the Costa was to blame for getting Mertesacker sent off, with the implication that the Chelsea forward was being a little less than honest. https://twitter.com/KevBeirne/status/691332087798980609