Watford have signed Chelsea defender Nathan Ake on a season-long loan after the youngster penned a five-year contract extension with the Premier League champions.
The 20-year-old Dutchman has made 12 senior appearances for the Blues since 2012.
Ake, who can also be used in midfield, played five times for Reading during a loan spell at the Madejski Stadium towards the end of last season.
Ake has won 13 caps at Under-21 level for the Netherlands.