The Spain international left the Basque side for Bavaria on a five-year deal earlier this summer, but his previous club are not amused with the German outfit's behaviourAthletic Bilbao president Josu Urrutia has revealed that the Basque side could take legal action against Bayern Munich in the wake of the transfer of Javi Martinez to the Bundesliga giants.
The midfielder underwent a medical with the Germans without permission from his club, before completing his move the following day, and the Basque side are not amused with die Roten's behaviour.
"We are looking into the possibilities of taking legal action against Bayern Munich," Urrutia stated at a press conference.
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Bayern Munich eventually met the player's €40 million [£32m] buy-out clause to lure the Spain international away from Bilbao and the 24-year-old made his official Bayern debut at the weekend in the 6-1 Bundesliga win over Stuttgart.