Italy defender Andrea Barzagli underwent a successful operation on his left knee on Friday, the head doctor of UEFA EURO 2008 announced.

The 27-year-old VfL Wolfsburg defender - capped 23 times - had injured his knee in training on Thursday as the world champions prepared for Sunday's quarter-final with Spain, ending his hopes of playing any further part in the tournament.

"The operation took 30 minutes and was a resounding success," Dr Gabler said.

"Andrea Barzagli should be able to resume training in a fortnight," added Dr Gabler, who combined with Italian team surgeon Andrea Ferretti on the operation, just as he had done with FIFA World Cup-winning captain Fabio Cannavaro prior to the tournament.

Barzagli, a former Palermo captain and a member of the 2006 FIFA World Cup winning squad, played in the opening 3-0 defeat by Holland but hasn't played since.

With his withdrawal the Italians are down to the bare bones for centre halves with youngster Giorgio Chiellini, Alessandro Gamberini - called up in place of Cannavaro - and Marco Materazzi, who lost his place after the opening-game mauling by Holland.

Against the Spanish Chiellini, 23, is likely to be paired with the 35-year-old Christian Panucci, as was the case in the draw against Romania and the win over France.