Chelsea have signed Feyenoord striker Salomon Kalou on a three-year deal.
Kalou signed a deal after passing a medical and agreeing terms
The 20-year-old had been heavily tipped for a switch to Stamford Bridge and completed his move after passing a medical and agreeing personal terms.
Kalou, who has signed for an undisclosed fee, scored 15 goals in 35 games in the Dutch League last season.
The striker was born in Ivory Coast but lost his bid to obtain Dutch nationality in time to play for Holland during this summer's World Cup.
Chelsea boss Jose Mourinho said the club had been watching Kalou for over two years and that he wore a disguise on a recent visit to see the player.
"We were watching him for a long time. Two seasons ago assistant manager Steve Clarke was in Holland and he was saying 'not yet, not yet, not yet'," he told Chelsea TV.
"This season we went there again and saw different people. I went for the last time in glasses, cap and scarf in Rotterdam and I saw him. I have no doubts the boy has everything.
"Saloman is a very impressive boy.
"Chelsea need big players and need the best young talent in the world and in Saloman we are getting that."
Kalou is the younger brother of Ivory Coast captain Bonaventure Kalou, who plays for Paris St Germain.
Supported by Netherlands coach Marco van Basten and the country's former playmaker Johan Cruyff, Kalou applied for Dutch citizenship but was denied by Immigration Minister Rita Verdonk.
She told parliament in March that Kalou did not fulfil the criteria for fast-track citizenship and would have to retake a Dutch language and culture test.
Kalou becomes Jose Mourinho's second signing of the summer after midfielder Michael Ballack arrived from Bayern Munich on a free transfer.
The Blues are also thought to be in negotiations with AC Milan over Ukranian striker Andriy Shevchenko.