Ospina impressed for Colombia at the World Cup in Brazil and agreed to move to Emirates Stadium last month.
"I love a challenge," he told Arsenal Player.
"I was expecting someone to come because Lukasz [Fabianski] has left for Swansea and I wish him all the best. I knew someone would come in. I'm just going to do the same thing over again, I'm going to try my best in every game and every week in training. Hopefully that will be enough."
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