MADRID, March 28 — Athletic Bilbao have been one of the surprises of the La Liga season so far, with brilliant displays from brothers Inaki and Nico Williams helping to spur a top-four challenge under the calm guidance of former Barcelona manager Ernesto Valverde.

Unbeaten at home since early August, the Basque club sit fourth in the table and will play in their 40th Copa del Rey final on April 6.