Joao Ferreira played 12 games during his loan spell with Portuguese top-flight side Rio Ave
Watford have signed Portuguese defender Joao Ferreira from Benfica for an undisclosed fee.
The 21-year-old has agreed a four-and-a-half-year contract at Vicarage Road, having spent the first half of the season on loan at Rio Ave.
Ferreira is a former Portugal Under-19 international and made his first-team debut for Benfica in January 2021.
Ferreira could make his Hornets debut in Saturday's home Championship game against Blackpool.
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