Five-times European champions Barca, with their trident of Lionel Messi, Luis Suarez and Neymar subdued, have not exited in the last 16 since going out to Liverpool in the 2006/07 season and the score equalled their worst Champions league loss.
Lionel Messi, Luis Suarez and Neymar combined to devastating effect as Barcelona swatted Celtic aside 7-0 at the Nou Camp to lay down a marker in Champions League Group C on Tuesday.
News of all that's transpired on and off the football field
Neymar's hat-trick lit up a powerful Brazil performance as the 32 nations taking part in this year's World Cup tested out their squads on a busy night of friendlies on Wednesday which also brought victories for Spain, Germany and France.
Images from the UEFA Champions League matches played on Wednesday
News of all that's transpired on and off the football field
Cristiano Ronaldo bagged his first five-goal haul in Real Madrid's 9-1 hammering of Granada while title-chasing Bayern Munich and Chelsea won again in Germany and England.
Cristiano Ronaldo set a record for goals scored in the group stage of the Champions League of 11 when he netted four against Malmo in Group A on Tuesday.
The mesmerising moments that made the 2018 FIFA World Cup a blockbuster worldwide.
IMAGES from the Champions League matches played on Tuesday
Pep Guardiola says Manchester City are not yet ready to compete with Europe's elite but his side will be confident of opening their Champions League campaign with victory over Borussia Moenchengladbach on Tuesday.
World champions Germany drew 1-1 with Spain in a high tempo friendly on Friday as they launched their preparations for a title defence in Russia while their opponents had striker Diego Costa making his long-awaited comeback as a substitute.
Wolfsburg shock Real Madrid 2-0 to crown big European night.
Sweden striker Zlatan Ibrahimovic crowned a triumphant homecoming with a second-half goal as Paris St Germain crushed Malmo 5-0 on Wednesday to book a place in the last 16 of the Champions League.
Atletico Madrid sealed top spot in Champions League Group D after second half goals from Frenchmen Kevin Gameiro and Antoine Griezmann but Napoli were held to a 0-0 Champions League draw at home by Dynamo Kiev.
A round-up of all the international friendlies played on Tuesday
Barcelona battled back from a goal down and scored twice in the second half to overcome hosts Borussia Moenchengladbach 2-1 in their Champions League Group C match on Wednesday despite the absence of the injured Lionel Messi.
Photos from the Champions League matches played across Europe on Tuesday