Brazilian playmaker Kaka has been ruled out for four months after undergoing a knee surgery on Friday and will miss Argentina clash in the World Cup qualifiers. AC Milan issued a statement on their official website which read: "AC Milan communicates that the footballer Kaka will on Friday be subjected to an arthroscopy on his left knee.” The 26-year old player has been struggling with a knee injury over the past couple of seasons. Tests have now confirmed that and operation is necessary. The World Player of the year traveled to Brazil and has been operated by the national team doctor Jose Luis Runco. The Selecao will face Paraguay away on June 15 and five days later they will host Argentina. Paraguay are at the top with 10 points just one ahead of second-placed Argentina while Brazil are third with 8 points.