Barcelona face another test of its post-Messi era when Real Madrid visits Camp Nou on an action-packed Sunday that also features a clash between the Spanish League leader and its defending champion.

The first Clasico since Lionel Messi left for Paris will inevitably overshadow an equally enticing visit by Real Sociedad to Atlético Madrid.
 
The visit by Madrid will close a three-game home stretch for Barcelona that coach Ronald Koeman called crucial to getting his team back on the winning path.