ROTTERDAM, Netherlands (Reuters) -- Ajax Amsterdam have signed Iceland striker Kolbeinn Sigthorsson from AZ Alkmaar on a four-year deal, the Dutch champions said on Monday.

The 21-year-old came through the Alkmaar youth ranks before breaking into the first team last season and scoring 15 goals.

According to Dutch media reports, Ajax will pay Alkmaar 4 million euros ($5,7 million) for Sigthorsson, who has won four caps for Iceland.

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