Cristiano Ronaldo rode to Manchester United's rescue late on for the third time in four Champions League matches to salvage a 2-2 draw at Atalanta on Tuesday.
Barcelona striker Sergio Aguero will be out for at least three months while his treatment for a heart problem is assessed, the club said on Monday.
Sergio Aguero was taken to hospital after suffering from breathing problems during Barcelona's 1-1 draw with Alaves on Saturday.
In 2015, Barcelona looked unstoppable. An unshakeable brand of football had just defeated a gritty Juventus in the Champions League final and Barca had arguably the greatest frontline of all time. The present was glorious; the future looked bright.
Ronald Koeman has been sacked as Barcelona coach after a torrid 14 months, with legendary midfielder Xavi Hernandez the strong favourite to replace him.
Ronald Koeman has been sacked as coach of Barcelona, the club announced on Wednesday, after defeat by Rayo Vallecano left the club ninth in La Liga.
Barcelona are hopeful they will one day be able to persuade Jurgen Klopp to take the reins at the Camp Nou, according to reports.
Goals from David Alaba and Lucas Vazquez saw Real Madrid secure a 2-1 victory at Barcelona to increase the pressure on Ronald Koeman.
Barcelona attacker Ansu Fati has agreed a new six-year deal and become the second player from the club to have his buy-out clause set at €1billion.
Chelsea asserted their dominance to secure a 4-0 victory over Malmo FF, while Manchester United came from behind to secure a 3-2 win over Atalanta in matchday three of the Champions League.