Bayern Munich midfielder Javi Martinez has insisted that close friend Santi Cazorla is capable of causing his side problems at the Allianz Arena on Wednesday.
Arsenal travel to Munich aiming for a comeback after losing the first leg of their Champions League last-16 tie 3-1 at the Emirates Stadium last month.
Martinez has revealed that he and Cazorla speak regularly and that his Spanish international colleague is loving life in London.
He told The Sun: "I speak to Santi a lot. He is a big friend of mine and we speak a lot and exchange a lot of texts.
"Santi is very comfortable in London. It is a place he likes and he enjoys playing for Arsenal.
"He keeps telling me how they are determined to come and win and do something special. We have to be very careful of him as he can hurt teams."
Bayern twice came from behind against Fortuna Dusseldorf at the weekend to record their 11th straight victory in all competitions.
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