Atletico Madrid suffered a humiliating 4-0 defeat against Benfica on Wednesday in a UEFA Champions League match that exposed their vulnerabilities.
Jan Oblak proved his worth as Atletico Madrid's saviour with two crucial saves in a hard-fought 1-0 victory over Celta Vigo, securing all three points.
Barcelona began their Champions League campaign with a 2-1 loss to Monaco, playing with 10 men after an early red card for Eric Garcia.
Diego Pablo Simeone was full of praise for Conor Gallagher and Julian Alvarez following their standout performances in Atletico Madrid's recent match.
Lamine Yamal's first-half brace powered Barcelona to a 4-1 win over Girona, extending their unbeaten start in La Liga and dominating their Catalan rivals.
Clement Lenglet is edging closer to making his debut for Atletico Madrid, as the French defender takes advantage of the international break and the absence of many first-team players to stake his claim for a starting role.