Roma captain Francesco Totti has admitted that the injury to defender Nicolas Burdisso is a major blow for his side. Burdisso damaged knee ligaments while playing for Argentina in their 2-1 away victory over Colombia in a 2014 Conmebol World Cup qualifier on Tuesday. The 30-year-old is now reportedly set to undergo more tests in South America to determine the exact extent of his injury and the recovery time before flying back to Italy.