Watford have announced the signing of young Portuguese midfielder Domingos Quina from West Ham.
The teenager joins the Vicarage Road residents on a four-year contract, with the club retaining the right to extend the deal by adding a further year.
Quina, who had stints at both the Benfica and Chelsea youth academies, joined West Ham two years ago.
He made two appearances for the Londoners during their 2016/17 Europa League campaign and is regarded as one of Portugal's brightest young prospects, having starred for his country at youth level.
"The Hornets are delighted to announce the deadline day signing of highly-rated Portuguese attacking midfielder Domingos Quina," the Hornets announced via their club website.