Barcelona have been shocked by Athletic Bilbao 1-0 at San Mames Barria.
Iker Muniain steered home the only goal of the contest 20 minutes from full-time as Barca slipped to a second loss in five days following their disjointed defeat to Ajax in the Champions League on Tuesday.
Barca coach Tata Martino said afterwards: "We were the better side until the 70th minute. What really hurt us was their goal because we had had moments of control and some penetrating attacks.
"We aren't used to losing - particularly not two in a row. We had been looking to put things right after the defeat in Amsterdam. I think things would have been different if we’d scored first - it would have been a different game- We had plenty of opportunities to score."
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