Mikel Arteta says Brentford's equaliser against Arsenal on Saturday was offside. Speaking after the 1-1 draw, he said: "I just looked at it [the Brentford goal] and it is offside."
The Spanish manager added: "You apply different rules and you have to change your principles."
The Gunners extended their lead to six points at least until Man City play Aston Villa on Sunday.
Arsenal will then face their main rivals on Wednesday.
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