FC Barcelona's seven-game winning run came to an end after losing 1-0 to Real Sociedad on Sunday evening.
Lamine Yamal and Hector Fort missed out through injury, as Barcelona to recalled Jules Kounde and Frenkie De Jong following last Sunday's win over Espanyol.
De Jong was involved in the Catalans' quest to hit the ground running earlier on and gained possession to go on a surging run in an attempt to unlock the host.
The high-flying visitors didn't stop probing and had the ball in the net through a decent finish from Robert Lewandowski, but he was called back for offside following a review from the Video Assistant Referee (VAR).
Sociedad were revived inside the half-hour mark as a rasping strike from distance by Brais Mendez required Inigo Pena to stretch and palm for a corner-kick.
The league leaders did go behind minutes after the half-hour spell when Sheraldo Becker capitalised on a knockdown to go level with Pena and finished comfortably.
Further uncertainty were highlighted by the Blaugrana who nearly gave away a second as Mikel Oyarzabal looked to make the most of a forward pass but failed to capitalise.
Barcelona responded to going behind from the bench and saw Olmo come on in place of De Jong before the second period commenced.
The chances didn't stop coming for the visitors a couple of minutes later as Pau Cubarsi snapped a probing cross by Pedri wide of the mark.
Sociedad remained defiant all-round and looked to add more moments thereafter with Mendez coming inside and forced Pena to a save.
Amidst the urge to go further ahead, the host still enjoyed complete ascendancy and denied Barcelona the chance to extend their lead at the top of the table.