Deportivo La Coruna have agreed terms with Watford to take right-back Juanfran back to Spain on a second successive season-long loan.
The 26-year-old made 34 league starts for the Galician club during the 2014-15 La Liga campaign, and helped them finish 16th.
"Juanfran will arrive in A Coruna and will join the team in training on Friday," said a Depor statement.
Watford agreed a £1.5m deal with Real Betis for the defender in 2014.
However, Betis sent him out on loan to Depor last season and he only officially sealed his permanent move to Watford this summer.