The deal means UEFA has completed its roster of 10 companies, a full 20 months ahead of the event itself and over a year earlier than for Euro 2004.
Castrol joins Carlsberg, Coca-Cola, JVC, Hyundai-Kia, MasterCard, McDonald's, Adidas, Continental and one company still to be announced.
UEFA CEO Lars-Christer Olsson said: "The addition of Castrol proves what a strong property the UEFA Euro has become in the global sports market."






