The Ghanaian international, who has already played with the Rossoneri from 2010 to 2013, had been dismissed from the German club last May after a 0-2 defeat against Cologne for his poor performance, although his contract runs until June 20, 2016.
Kevin-Prince Boateng was kicked out of the squad 10 days ago following their shock 2-0 league defeat at Cologne.
Citing religious violence at home, close to 200 Ghanaians have applied to stay permanently in Brazil.
Portugal did not fare much better than Ghana, because it, too, was knocked out. Even with the United States losing to Germany, 1-0, in Recife, the U.S. advanced, on goal differential.
Just a day after seeming to resolve a possible player mutiny over World Cup bonus payments, the Ghana Football Association released two separate statements saying two of the country's stars, Sulley Muntari and Kevin-Prince Boateng
Both Arsenal and Barcelona have won two games out of two and victory on Matchday 3 will take them closer to qualification for the knockout phases.
Boateng suffered a knee injury after scoring in Schalke's match against Augsburg on October 5.
European champions Bayern will provide an acid test of Schalke's winning streak, but there promises to be fireworks when the Boateng brothers clash. "He is my brother, but there will be no love lost in the game," said Berlin-born Kevin-Prince Boateng.
Dortmund dislodged Bayern, who beat Hanover 96 2-0, from the top of the table after a 6-2 victory over Hamburg.
The 26-year-old German-born Ghanaian international started his career in the Bundesliga with Hertha Berlin, his hometown team, in 2005.
Milan coach Massimilano Allegri, who was lucky to hang on to his job at the end of last season as the Rossoneri finished third following a disastrous first half of the campaign, said his joy was tempered by renewed criticism.
German-born Ghanaian Kevin-Prince Boateng claimed in a newspaper interview on Friday that being targeted with racist abuse from some fans almost prompted his departure from Italy.
In the latest in a string of incidents involving Italian clubs, Tottenham's Togolese forward Emmanuel Adebayor was apparently targeted by monkey chants during Thursday's match at the San Siro.
The U.N.'s human rights office says Boateng and former France captain Patrick Vieira will attend its "Racism and Sport" discussion on March 21.
Milan, crowned European champions seven times, had failed to beat the four-times winners in the Champions League since a 2-0 win at the Camp Nou in 2000 and had also exited the competition last season and in 2006 after defeats to the Spaniards.
No changes were made at half-time, but the game itself went on to change dramatically. On 53 minutes tempers frayed when Sergio Busquets brought down Pazzini in midfield, earning the Spaniard a yellow card.
Blatter's remarks come in the light of Ghanaian midfielder Kevin-Prince Boateng leading his AC Milan team-mates off the pitch in a club friendly earlier this month after being racially abused.
Blatter is adamant the game should always go on whatever the provocation, but he does admit that greater sanctions need to be placed on guilty parties if football is to effectively combat racism.