MADRID (Reuters) -- Dutch side AZ Alkmaar have agreed to sign U.S. forward Jozy Altidore from Villarreal on a four-year contract, the two clubs said.

The 21-year-old has spent most of his stint with Spanish side Villarreal out on loan and has played for clubs including La Liga's Xerez, Hull City of the English Premier League and most recently Bursaspor of Turkey.

Altidore, who was the first U.S. international to score in La Liga when he netted against Athletic Bilbao in November 2008, has represented his country 39 times, scoring 12 goals, and started all four U.S. matches at the 2010 World Cup.

SI Apps
We've Got Apps Too
Get expert analysis, unrivaled access, and the award-winning storytelling only SI can provide - from Peter King, Tom Verducci, Lee Jenkins, Seth Davis, and more - delivered straight to you, along with up-to-the-minute news and live scores.