The 25-year-old claims that his three years at Real Madrid have made him used to playing big matches with calm.
"I've played for Real Madrid, where the pressure is so huge because you have to go and really win absolutely every game," he told The Mirror.
"So after having played there for three years, pressure doesn't scare me. That's why I don't really feel the pressure. The second thing is that what I do on a daily basis is what I love.
"I love playing football so I go out to play football and I don't really feel ¬pressure. Of course, there are some days when things don't work out as well as on other days but that doesn't have anything to do with pressure."
Arsenal are currently four points clear at the top of the Premier League table.