Seasoned Swiss international Valon Behrami has signed a two-year contract with Serie A side Udinese.
The 32-year-old midfielder, who joined the Hornets from Hamburg in 2015, has departed for an undisclosed fee, after 49 appearances in all competitions during his two seasons in England.
Udinese director general Franco Collavino revealed his delight at signing the former Lazio, West Ham, Fiorentina and Napoli man.
He said: "We closed the deal very quickly.
"Udinese wanted a player with these characteristics and with this experience in our league, Serie A, where Behrami wanted to go back to test himself.
"This is an important purchase for technical expertise, an investment for this season and the project we are pursuing."
A statement from Watford read: "Watford FC thanks Valon for his efforts at the club and wishes him well for the future."