Branislav Ivanovic completed his dream move to Chelsea today after agreeing a three-and-a-half year deal with the English club.
The Lokomotiv Moscow defender is coach Avram Grant's second January signing following the arrival of Nicolas Anelka from Bolton last week for £15million.
Chelsea are thought to have paid around £9m for the 23-year-old Serbia and Montenegro international who is relishing the chance to play in the Barclays Premier League with the Blues.
Ivanovic said: 'It is the dream of every footballer to want to move on and improve yourself - and the ultimate is to play for such a big team as this.'
The Serbian international is a versatile addition to Chelsea's squad as he can play right back, centre back or as defensive midfielder.
He began his career in Serbia with Sremska Mitrovica before moving to Belgrade to play for OFK Beograd where he remained for three seasons.
He signed for Lokomotiv in the summer of 2006 and appeared for the Russian side in this season's Uefa Cup.
A star of Serbia's Under 21s in both the 2006 and 2007 European Championships, Ivanovic was voted into last summer's Uefa Team of the Tournament, and has successfully graduated into a regular for the full national side.
He made his Serbia and Montenegro debut in June 2006, and is now a regular in the Serbian line-up alongside Manchester United's Nemanja Vidic. He has nine caps and has scored once.