Dutch midfielder Marco van Ginkel has completed his move to Chelsea for an undisclosed fee, the club's official website has confirmed.
The Blues revealed that they have agreed fee for the transfer earlier this week.
The 20-year-old has now signed a five-year contract with Chelsea, keeping him at Stamford Bridge until 2018.
Van Ginkel was also chased by Manchester United, but Chelsea were the favourites to land the young starlet, as revealed by the player's agent last month.
Chelsea have reportedly assured the midfielder of first-team action at Stamford Bridge, which proved decisive for the player's move from Vitesse Arnhem.
He said: "I'm very happy to be here at such a nice club with great players. I am really happy, the stadium is good and the training ground is fantastic."
Van Ginkel, who was named Dutch Talent of the Year last season, represented Netherlands at the European Under-21 Championships in Israel last month.
The highly-rated midfielder was a regular starter for Vitesse last campaign and will become Jose Mourinho's second signing on his return to Chelsea.
The west London club have previously completed the signing of German winger and striker Andre Schurrle from Bayern Leverkusen.
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