After an even first 45 minutes, strikes from Pablo Sarabia and Wissam Ben Yedder stunned the Catalans and left them needing a second-leg comeback at the Nou Camp for the second consecutive round in the competition.
FIFA president Sepp Blatter praised AC Milan midfielder Kevin-Prince Boateng on Monday for displaying courage when he walked off the pitch last week in protest at racial abuse.
AC Milan striker Kevin-Prince Boateng led the team off the pitch during a friendly at Italian lower division side Pro Patria on Thursday in protest at racist chanting by the home fans.
Midfielders Kevin-Prince Boateng and Sulley Muntari have been suspended from Ghana's World Cup team with immediate effect after they clashed with coach Kwesi Appiah and a soccer federation (GFA) official.
AC Milan's walkoff after midfielder Kevin-Prince Boateng was racially abused in a friendly this month was against the rules but the club will not be punished, Serie A's disciplinary commissioner said on Tuesday.
AC Milan midfielder Kevin-Prince Boateng, who led a walk-off in a club friendly in January after being racially abused, believes the game needs to be more multi-cultural.
Kevin-Prince Boateng and Sulley Muntari put Ghana in the Champions League spotlight as they scored the goals which gave AC Milan a shock 2-0 win over Barcelona on Wednesday.
Images from the Champions League matches played across Europe on Wednesday.
Champions League competitors Schalke 04 have signed AC Milan midfielder Kevin-Prince Boateng on a four-year deal after the Ghana international passed his medical at the German club on Friday.
Deducting points from teams whose fans or players are guilty of racism is a better way of tackling the problem than players walking off the pitch and abandoning matches, FIFA President Sepp Blatter said on Monday.
Racist chanting that led AC Milan players to walk off the pitch during a friendly match provoked howls of outrage in Italy on Friday, while club owner Silvio Berlusconi vowed his team would abandon all matches where they suffer similar abuse.
Zlatan Ibrahimovic inspired AC Milan to a 4-0 demolition of Arsenal in the Champions League on Wednesday, although the sorry performance of the visitors had as much to do with the scoreline as the volatile Swede's brilliance.
AC Milan's season slumped to a new low on Sunday as they had two players sent off and lost 2-1 at Udinese while the bizarre postponement of the Cagliari-AS Roma match further damaged Serie A's fading credibility.
Xavi produced a goal of surgical precision to give Barcelona a 3-2 win over AC Milan on Wednesday in an enthralling Champions League match which also featured Zlatan Ibrahimovic scoring against the Catalan club he left acrimoniously last year.
Kevin-Prince Boateng scored a hat-trick within 18 minutes of coming on as a half time substitute as AC Milan bounced back from being 3-0 behind to win 4-3 at Lecce in an astonishing Serie A match on Sunday.
Marco Borriello bagged his first goal for Juventus as they maintained their three-point lead at the top of Serie A on Wednesday with a 1-0 win over already-relegated Cesena.
AC Milan earned the early bragging rights by beating city rivals Inter Milan 2-1 in the Italian Super Cup played in Beijing Sunday.
Ghana crushed American dreams and delivered African joy on Saturday when they beat the United States 2-1 after extra time of a thrilling contest to take their place in the World Cup quarter-finals.
Giampaolo Pazzini's double helped AC Milan take third place in Serie A with a 3-0 home victory over 10-man Lazio at the San Siro on Saturday.
Xavi scored a typical Barcelona goal to give the European champions a 3-2 win over AC Milan in a Champions League match which was enthralling but of little importance on Wednesday.
AC Milan recovered from a goal down to win 3-1 at 10-man Catania thanks to a second-half double from Stephan El Shaarawy and a strike by Kevin-Prince Boateng who was sent off near the end of a lively Serie A clash on Friday.
Portsmouth will have an FA Cup final to look forward to at the end of a tortuous season after a shock 2-0 semi-final victory over Tottenham Hotspur Sunday.
Kevin Prince Boateng scored the first goal and impudently set up Robinho for the second to help rampant Serie A leaders AC Milan to a 3-0 win at troubled club Bologna on Sunday.
Ghana goal hero Kevin-Prince Boateng faces a week of intensive therapy in a bid to get fit for the World Cup quarter-final after suffering a hamstring injury.
Chelsea overcame a resilient Portsmouth to win a dramatic FA Cup final 1-0 at Wembley Stadium on Saturday and achieve their first League and Cup Double.
Kevin-Prince Boateng scored his first goal for Schalke 04 on Saturday to earn his team a 1-0 win at Mainz 05 and champions Bayern Munich beat Hanover 96 2-0.
AC Milan midfielder Sulley Muntari looks set to leave the club after being left out of the squad for Saturday's Serie A match away to Palermo at his own request, his agent Federico Pastorello said on Friday.
Michael Essien is poised to make a first international appearance in more than two years after being named as a surprise inclusion in Ghana's squad for a key World Cup qualifier against Zambia next month.
The good news for Schalke 04's defenders as they prepare to face Chelsea in their opening Champions League Group G match on Wednesday is that striker Diego Costa is nursing a slight hamstring injury.
Champions League competitors Schalke 04 have signed AC Milan midfielder Kevin-Prince Boateng on a four-year deal after the Ghana international passed his medical at the German club on Friday.
The rest of Barcelona's squad will have to do "a little bit more" to make up for the absence of five-times World Player of the Year Lionel Messi for the next three weeks, according to captain Andres Iniesta. The Argentina forward faces a spell on the sidelines after sustaining a groin injury in Wednesday's 1-1 La Liga draw with Atletico Madrid. "There's no question we are stronger with Messi," Iniesta told Cadena Cope radio ahead of Saturday's match at Sporting Gijon. "When these things happen we all have to give a little bit more.
A solid defence helped Schalke 04 secure a 1-0 win at home to Borussia Moenchengladbach on Friday that lifted them above their rivals into third spot in the Bundesliga in the battle for Champions League places.
Moritz Stoppelkamp scored an extraordinary goal from deep inside his own half, a Bundesliga record 83 metres, to cap a 2-0 win for upstarts Paderborn over Hanover 96 on Saturday, helping the promoted side go to of the table.
Barcelona have been linked to a host of forwards during the winter transfer window as they seek experienced backup options for Luis Suarez.
Fans protested against Monday night football in the Bundesliga as Eintracht Frankfurt beat visiting RB Leipzig 2-1, delaying the start of both halves of the match, the second by throwing hundreds of tennis balls onto the pitch.
Lionel Messi scored one penalty and missed another as Barcelona beat Real Valladolid 1-0 on Saturday to open up a seven-point lead at the top of La Liga.
An own goal by John Boye and a late strike by Cristiano Ronaldo gave Portugal a 2-1 victory over incident-hit Ghana on Thursday, but it was not enough to make the second round as both sides exited the World Cup.
News of all that's transpired on and off the football field
News of all that's transpired on and off the football field
Chelsea manager Jose Mourinho, who said he made "11 mistakes" in his team selection after Chelsea lost to Newcastle United on Saturday, will not want to get it wrong again when Schalke 04 visit StamfordBridge in the Champions League on Wednesday.