Chelsea have confirmed the signing of Spain youth international Oriol Romeu from Barcelona on a four-year contract.
The defensive midfielder, 19, made his Liga debut for Barca late last season and is regarded as one of the hottest properties in his position in Spain.
He will join the club after the U20 World Cup in Colombia, Chelsea said on their website. No transfer fee was disclosed, but he is believed to have cost in the region of £5 million.
The deal was not a surprise as the clubs had announced a deal in principle late in June. Back then the player said: "Chelsea is a great option for me. Leaving Barca hurts, but you have to take your chances."
Romeu is Chelsea's second major signing of the summer after Belgian goalkeeper Thibaut Courtois, who was immediately loaned to Atletico Madrid.
The Premier League runners-up are expected to add at least one more player to the squad this transfer window, with Anderlecht striker Romelu Lukaku and Tottenham playmaker Luka Modric linked to the West London club.
The fact remains that the player is an unknown. If you had to raid Barca's reserves, you'd have been much better off signing the likes of Bojan or Jeffren, who have experience in top flight and Champions League football.