The Catalan giants left Spain first thing today ahead of the Champions League crunch match with Celtic tomorrow night.
The travelling party contained 19 first-team players as well as two reserve call-ups as Gerardo Martino faces up to the Group H tie without Lionel Messi.
The Argentinian hobbled off after scoring in Barca's 2-0 win over Almeria on Saturday and didn't even travel with the rest of his team-mates to Scotland as he faces up to three weeks out with a thigh injury.
"Leo Messi has a small injury to the biceps femoris (thigh) in his right leg," a Barcelona statement read.
"This was confirmed by medical tests undertaken by the player on Sunday morning at Medical Services Sport City.
"The Argentinian will be out for approximately two to three weeks, which will certainly force him to miss Barcelona's two games this week - on Tuesday against Celtic and next Saturday at the Camp Nou against Valladolid."
Barcelona are already set to be without a large chunk of their defence for the midweek trip to Scotland due to injury.
Javier Mascherano, who has been in good form this season, was ruled out in midweek with a hamstring problem to join Jordi Alba, who is suffering the same injury.
Veteran centre-back Carles Puyol is still recovering from his long-term injury problems.
There was also call-offs for fringe stars Isaac Cuenca and Ibrahim Afellay.
In a bid to boost his dwindling numbers, Martino has drafted in Sergi Gomez and Patric Gabarron from their B team for the crunch tie.
The Barca team, including midfielder Xavi who racked up his 450th appearance for the Nou Camp club on Saturday, will train at 7pm this evening at Parkhead.