Barcelona began the game with what appeared to be a back three comprised of Gerard Pique, Samuel Umtiti and Jeremy Mathieu.
Jeremy Mathieu's injury-stricken year continued as he was forced off during Barcelona's hard-fought 2-1 win at Atletico Madrid on Sunday.
Lionel Messi's 20th La Liga goal of the season earned Barcelona a late win over Atletico Madrid.
Koke bossed the midfield, which is no easy feat against a side like Barcelona, but it wasn't enough to prevent Atletico slipping to a late defeat.
Lionel Messi wasn't his best but scored the crucial late goal, while Neymar caused endless havoc as Barca beat Atletico Madrid late on.
Atletico Madrid coach Diego Simeone said that Barcelona's "great quality in the penalty areas" had again proved decisive after Sunday evening's loss.