Juventus custodian Gianluigi Buffon will finally go under the knife next week, following months of suffering with a knee injury. The Italy number one has a broken meniscus and is likely to be sidelined for six weeks after surgery. "Buffon will have an operation on Sunday," the 31-year-old's agent Silvano Martina told Calciomercato.it. "I don't know if he will play against Bari on Saturday, but in my opinion he won't. "We are not dealing with a serious injury and he could return to the first team within five or six weeks." During Buffon's absence, Austrian veteran Alex Manninger is likely to be between the posts for the Bianconeri.