The Spain international has been linked with a move to Barcelona in the past few weeks, and is also reigniting the interest of Manchester City, as Goal.com exclusively revealed this week.
Nevertheless, the 23-year-old has stressed that he is happy to see out his current contract with the Basque side.
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"I've read a lot of things in the newspapers, but not everything that's being said is true. If we were to believe all the rumours, I'd have signed for seven different teams already."
Martinez has made over 200 Primera Division appearances for Athletic since making his official debut in 2006-07.