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Marcelo Bielsa has extended his contract with the Bilbao club for another year.
The Basque team led by the Argentine coach reached the finals of the UEFA Europa League and the Spanish King's Cup tournament, but suffered defeats in both.
Rumors have been circulating that the future of the 56-year-old coach, who has implemented an attacking football philosophy, may lie with London's "Chelsea", but an agreement reached on Sunday denied such speculations.
In the Spanish league, "Athletic" remains in tenth place.
