CAPE TOWN, SOUTH AFRICA - JUNE 14: Antolin Alcaraz of Paraguay scores the first goal past Gianluigi Buffon of Italy during the 2010 FIFA World Cup South Africa Group F match between Italy and Paraguay at Green Point Stadium on June 14, 2010 in Cape Town, South Africa.
Italy goalkeeper Gianluigi Buffon has a "serious" back problem and the team physician is not sure when he'll be able to play again in the World Cup. Buffon exited Italy's 1-1 draw with Paraguay on Monday at halftime, and was replaced by backup keeper Federico Marchetti.
Team physician Enrico Castellacci said Tuesday that the problem was with the left side of Buffon's sciatic nerve, adding that "at the moment, no date can be set for his return." He also says Buffon will immediately begin physiotherapy. Buffon was absent from Italy's workout Tuesday. Italy's next opponent in Group F is New Zealand on Sunday.