Watford sign midfielder Nathaniel Chalobah from Chelsea on a five-year deal for an undisclosed fee.
Mario Suarez leaves Watford to join Chinese Super League side Guizhou Hengfeng Zhicheng FC for an undisclosed fee.
The Gambia's Sulayman Marreh says he is not disappointed to be loaned out by English club Watford before playing a match.
Watford sign Spanish right-back Kiko Femenia from Alaves and Austria Under-21 goalkeeper Daniel Bachmann from Stoke.
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Audio & Video
Outgoing Watford manager Walter Mazzarri says he would like to manage in the Premier League again one day, after losing his last game in charge of the Hornets 5-0 to Manchester City.