( CNN ) -- English club Chelsea have completed the signing of Oriol Romeu from Spanish and European champions Barcelona . The 19-year-old is currently playing for Spain at the World Under-20 Championships in Colombia and has signed a four-year deal with last season 's Premier League runners-up . The deal is worth $ 7 million and includes a buy back clause , set at $ 14 million after the first year and $ 21 million after the second . Romeu started his career at Barcelona 's city rivals Espanyol before joining the Camp Nou academy in 2004 . The midfielder , who can also play in central defence , made his debut for Barcelona in last season 's Spanish Supercup match with Seville and got his first taste of league action against Deportivo in May 2010 . He has played 90 minutes in both of Spain 's games at the World Under-20 Championships , when they beat Costa Rica and Ecuador . Chelsea official web site confirmed the signing and said Romeu is `` renowned for his strength and his expansive passing ability . '' Another player leaving Barcelona is Jeffren Suarez after he agreed to join Sporting Lisbon . The Portuguese outfit have paid $ 5 million for the 23-year-old which , like the Romeu deal , includes a buy back option . Jeffren joined Barca from Tenerife in 2004 and made his debut for the Catalan club in the 2006-07 season . He told the club 's official web site : `` I know that the slogan of my new club is strength , dedication , commitment and glory and from today onwards I will do all in my power to make these things come true . '' Barcelona also confirmed that Argentinean defender Gabriel Milito can leave the club on a free transfer . Meanwhile , Juventus have confirmed they have rejected a bid from Russian club Zenit St Petersburg for defender Leonardo Bonucci . The 24-year-old joined from Bari at the beginning of last season and a statement on the club 's web site said they wanted to keep hold of the player .
Juventus complete the signing of Barcelona youngster Jeffren Suarez . The 19-year-old joins for $ 7 million but the deal includes a buy back option . Oriol Romeu leaves Ecuador to join Argentinean club Sporting Lisbon .