(Adds Prandelli quotes, details) By Mike Collett LONDON, May 31 (Reuters) - Italy suffered a serious blow ahead of the World Cup when midfielder Riccardo Montolivo broke his leg during a warm-up game against Ireland at Craven Cottage on Saturday. It will probably need some months, Riccardo is out of the World Cup. He didn't deserve this," team doctor Enrico Castellacci told Rai television. The elegant AC Milan midfielder was accidentally caught in a challenge by defender Alex Pearce after 10 minutes and, having stood up to test his leg, went to ground and was carried off on a stretcher after five minutes of treatment on the field. More...