"I think it was offside and he (Romelu Lukaku) made a foul on the goal, but the referee didn't give it," manager Wenger told reporters after the game.
"[Laurent] Koscielny can take the cross, head the ball, but he cannot do it because of [Lukaku's] overhead kick, but it doesn't mean we have to concede a goal behind that. You have to give Deulofeu credit, he took his goal well.
"It just feels that when we got out of the pressure, and got into the passing, they stopped us every time with a foul."
Arsenal find themselves five points clear at the top of the Premier League following this afternoon's draw.