Watford full-back Ryan Andrews has signed for Swiss club Young Boys for about 3m euros (£2.6m).
The 21-year-old came through the Hornets academy and made 96 first-team appearances, the last as a late substitute in Saturday's 2-2 draw with Southampton.
Andrews has agreed a four-year deal with Young Boys and technical director Mathieu Beda said: "Ryan Andrews is an exciting player with a very good mentality. He is dynamic, fast, and hungry. These are qualities we want to see in our team."
Young Boys are fifth in the Swiss Super League with eight points after five games of the new season.