Barcelona's title defense took a blow on Saturday when it stumbled to a 1-0 defeat at Valladolid, missing the chance to move to the top of the Spanish standings ahead of its Champions League clash with Manchester City at Camp Nou.
Lionel Messi was the only Barcelona player who looked sharp, while his teammates were plagued by uncharacteristic passing errors and again proved brittle at the back.
Relegation-threatened Valladolid outplayed the defending champions early and midfielder Fausto Rossi netted the winner in the 17th minute.
Leader Real Madrid can increase its one-point advantage over Barcelona when it hosts Levante on Sunday.
Barcelona hosts Manchester City on Wednesday looking to protect its 2-0 lead in the second leg of their Champions League last-16 tie.