Diego Costa cost us once more, says Arsene Wenger

Arsenal boss Arsene Wenger said they had again fallen victim to Chelsea's Diego Costa after Per Mertesacker's "harsh" red card in Sunday's defeat.

Mertesacker was sent off in the 18th minute after tripping Costa - who scored the only goal in Chelsea's win.

"Costa has got two of our players sent off in the last two games against Chelsea," said Wenger. Is the decision right or wrong? I don't know. That is a fact, without accusing him of anything."

Costa was also involved in the clash that saw Arsenal's Gabriel sent off in Chelsea's 2-0 home win in September.

- BBC