The 32-year-old Italy international, whohas not featured sinceNovember, reported for pre-season training with the Serie A club, but Copa Football Bootssent to see a specialist in Germany last week after experiencing Nike Free 4.0 V3discomfort.Roma revealed on Saturdaythat Balzaretti had undergone an operationand isset for spell on the sidelines. "The player has already begun post-operative rehabilitation sessions in Trigoria that will involve physical therapy and, starting next week, athletic work," Roma said in a statement on their official website.The former Palermo man made only 11 appearances for Rudi Garcia,s side lastseason as they secured second spot behind Juventus.