Since 2010, Chelsea has been regularly sending its youngsters to Eredivisie club Vitesse. During the past three-plus years, eleven Chelsea players have graced the pitch at the Gelredome, and Chelsea currently have six players at Vitesse. To put this in perspective, only three Premier League clubs have loaned more players total than Chelsea has loaned to Vitesse this season.
http://weaintgotnohistory.sbnation.com/2013/11/13/5098996/chelsea-fc-vitesse-arnhem-relationship

Since 2010, Chelsea has been regularly sending its youngsters to Eredivisie club Vitesse. During the past three-plus years, eleven Chelsea players have graced the pitch at the Gelredome, and Chelsea currently have six players at Vitesse. To put this in perspective, only three Premier League clubs have loaned more players total than Chelsea has loaned to Vitesse this season.

http://weaintgotnohistory.sbnation.com/2013/11/13/5098996/chelsea-fc-vitesse-arnhem-relationship