Their visitors to the Camp Nou this weekend did something last term that Barca could not - win a title - and Segunda Division champions Eibar have made a solid start to their first ever top-flight campaign.
Three successive draws prior to the international break have left Gaizka Garitano's side ninth in the table and unbeaten in four matches ahead of their first ever match against Barcelona's first team.
While the Catalan giants perhaps represent their biggest test yet, Eibar have performed admirably against La Liga's big boys so far, drawing with Villarreal and Athletic Bilbao and only losing by one to champions Atletico Madrid.
Lionel Messi and Neymar have each scored in Barcelona's last three games, and this is the penultimate match in which Enrique's dream front three will be without the services of the suspended Luis Suarez.
Jordi Alba could be recalled at left-back after only being among the substitutes for the 2-0 win over Rayo Vallecano, in a defensive reshuffle which will likely see Marc Bartra omitted from the starting XI.
Possible starting lineups
Barca: Bravo; Alves, Pique, Mathieu, Alba; Busquets, Rakitic, Iniesta; El Haddadi, Messi, Neymar
Eibar: Xabi Irureta; Boveda, Rodriguez Navas, Abraham Minero; Albentosa, Errasti, Dani Garcia, Saul, Javi Lara; Piovaccari, Arruabarrena
Sports Mole says: 2-0