Defender Thomas Vermaelen, signed from Ajax for £10million during the summer, said: "Maybe we were a little bit underestimated at the start of the season. "A lot of people were talking about Arsenal not being good enough to be at the top, but we have done well so far in the Premier League and Champions League.
"We have some big games coming up including Chelsea. If we have a good result against them, then it will be very big for us."
The Belgian centre-back added: "I think we are confident if we play our own game.
"If we do, we can beat a lot of opponents but we have to do it in every game and that is the most difficult thing."
