Real Madrid and Barcelona will be looking to maintain their 100 percent starts to the Liga season when they face tough tests against Athletic Bilbao and Valencia on Sunday.
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Madrid are first up when they host Athletic, who have also won both their opening matches, at the Santiago Bernabeu in the first midday kick-off of the new campaign.
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Los Blancos have been made to wait to welcome Gareth Bale to the Spanish capital as his prolonged transfer from Tottenham Hotspur has dragged on for another week, but coach Carlo Ancelotti is more concerned with how those already at his disposal have performed so far.
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Real have won both their matches against Real Betis and Granada by just the odd goal and the Italian is looking for an improvement against an Athletic side he rates highly.
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"The match tomorrow isn't easy because Athletic have won their first two matches and have a very good and professional manager who I know well," he said on Saturday.
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"Our objective is to start playing better. We want to play with intensity and I think tomorrow is just the moment to do so."
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German midfielder Sami Khedira is available again after missing Monday night's win at Granada through injury and former Real Sociedad man Asier Illarramendi could make his Madrid debut as he also takes his place in Ancelotti's squad for the first time after a disrupted pre-season due to injury.
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Ander Herrera meanwhile has been included by Athletic boss Ernesto Valverde in his squad despite Manchester United's interest in signing the midfielder before Monday's transfer deadline.