The Spanish soccer giants were quick to invite the 17-year-old to train with them yesterday, fresh off the back of their UEFA victory over Shakhtar Donetsk on Wednesday night.
The win makes it all the more likely that Barcelona will face their most hated rivals Madrid in the quarter finals of the competition.
Call up: Justin Bieber trains with Barcelona yesterday after wearing their home strip in Madrid on Tuesday
Such is the grip of Bieber fever, however, that the local children seemed unperturbed by his controversial choice.
Admittedly , his bodyguards were more likely to suffer for him wearing the strip of Real's hated rivals for a kickabout on the outskirts of the city.
Skill: The pop juggernaut is all-conquering on the pitch, too...Barcelona confirmed on their website that he is surprisingly gifted with his left foot
Devoted: Bieber is such a fan of the Catalan giants that he wore their strip deep in Real Madrid territory
On Wednesday after arriving in the city, fans lined the fencing of a park where Bieber was playing a match with his entourage.
And it turns out they were greeted by a display of some skill, rather than just the sight of their idol in shorts.
Barcelona's official website reports, Bieber showed "surprisingly decent skills with his left foot."
Bieber arrived at their Ciutat Esportiva training ground to take part in a session and turned out to be so good that he even got to play a game with Thiago, Bojan and Andreu Fontas
Renaissance man: Multi-talented Bieber held his own on the pitch amongst talent like Bojan
New career: Bojan was so impressed with Bieber he wouldn't stop shaking his hand, a career could beckon if his multi-millionaire pop adventure ends
The teenager was spotted taking shots at B-team goalkeeper Ruben Mino, and being enthusiastically praised by Bojan, who kept shaking the singer's hand.
Dedicated: Bieber wears Barcelona shorts for a kickabout in one of the city's park the day before his big call up
Bieber fever: Fans hear that their idol is playing football with his entourage in a local park and flock to catch a glimpse
Bieber of course, is well acquainted with rival Real Madrid's most starry former player, David Beckham.
Becks first met up with Bieber last May when he and Victoria took their three boys, who are all huge fans, to see him perform at The Grove mall in Hollywood.
Brave: Bieber trains in Madrid on Tuesday wearing the ultra recognisable classic Barcelona home kit
Beckham, whose wife Victoria is pregnant with their fourth child, was speaking to American chat show host Jimmy Kimmel when he shared the funny story.
Smash hit: Beiber's concert in Barcelona was a sellout, his My World tour is bringing the house down across Europe
Celebrity: Barcelona's Gerard Pique is dating pop sensation Shakira, David Beckham says son Romeo (pictured) wants to name baby after Bieber
The pop juggernaut was taking time off from his appropriately titled European 'My World,' for the training sessions.
On Wednesday night, as his heroes thrashed their Ukranian opposition 5-1, he performed to an sellout crowd at the Palau Sant Jordi in the city.