 On 23 August 2012, Cassetti signed for Udinese on a one-year deal, agreeing to join Watford on a season-long loan on the same day.Udinese did not publicise their signing of Cassetti, meaning that it was a move purely for the benefit of the English Championship club.In June 2013, Cassetti signed for Watford permanently and scored his first goal for the club in a 3–3 draw at home to Blackburn Rovers on 25 March 2014.