The former Barcelona youth player has agreed a five-year deal with the Hornets
Watford have signed defender Marc Navarro from Espanyol for an undisclosed fee.
The 22-year-old Spaniard, who came up through the youth ranks at Barcelona, has agreed a five-year deal with the Hornets.
Watford chairman Scott Duxbury said on his club’s website: “Marc has attracted interest from a host of top European clubs, therefore we are delighted to have secured his services.”
Navarro, who can play at full-back or centre-half, left Barcelona for city rivals Espanyol aged 16. He made his LaLiga debut in January 2017, scoring in the 3-1 win over Granada and went on to chalk up 36 appearances.
Hornets boss Javier Gracia has slowly been shaping his squad for the new Premier League campaign.
Earlier this week, Watford reached an agreement to sign midfielder Gerard Deulofeu from Barcelona for an initial 13 million euros (Ł11.47million) following a successful loan spell last season.
The club have also taken up the option of a one-year contract extension for defender Miguel Britos and brought in England Under-19 defender Ben Wilmot from Stevenage.