Deulofeu spent the latter half of the 2017-18 season on loan at Watford and has now signed a five-year deal with the club.
Watford have confirmed the permanent signing of Spanish winger Gerard Deulofeu from Barcelona following his loan at Vicarage Road in the second half of the 2017/18 season.
The former Everton man scored once in seven Premier League appearances for the Hornets, with the deal that now makes him a Watford player thought to be worth around £11.5m.
Deulofeu has agreed a five-year contract until the summer of 2023.
The 24-year-old started his career in the youth ranks of Barcelona, graduating from the famed La Masia setup and making his first team debut in 2011.
He became an important player for Barcelona B, before leaving Camp Nou for Everton on loan in 2013. The player later returned to Merseyside on a permanent deal following a loan at Sevilla. After a further loan spell at AC Milan, Barcelona activated a buy back clause in 2017.
Deulofeu played a total of 17 games in his final half season with his boyhood club in 2017/18 and can now look forward to a promising future in the Premier League with Watford.