Gerard Deulofeu has signed a permanent deal with Watford after spending part of last season at Vicarage Road.
The 24-year-old Spanish international was on loan with the Premier League club during the latter half of the 2017-18 season, making seven appearances.
Our ambition to succeed and grow in the Premier League remains as strong as ever.Scott Duxbury
Now the club have acted to bring him back to the club and he has signed permanently from Barcelona.
Watford chairman Scott Duxbury said: "We are very pleased to welcome Gerard back to Vicarage Road and thank FC Barcelona for their part in concluding this deal.
"Our ambition to succeed and grow in the Premier League remains as strong as ever."
The forward graduated from Barcelona's La Masia Academy and made his debut for the senior team at the age of just 17.
He made over 20 appearances for the Spanish club but has had several loans spells away, with Sevilla, AC Milan and two spells at Everton.
He has four caps for Spain, his most recent appearance for his country coming in 2017 in a World Cup qualifier against Liechtenstein.
He will join a club who finished 14th in the Premier League last term. They had an excellent start to the season, losing just one of their first eight matches.
However, they then endured a poor run which cost Marco Silva his job. Javi Gracia took over and he remains and hopes to add other new faces in the coming days and weeks with reports that the club have agreed a fee with Bologna to sign left-back Adam Masina.
The Hornets plans for pre-season include matches against Stevenage and Brentford before the new Premier League season begins on 11th August.
Everton are 80/1 to finish in the top six.
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