[2] Vallés returned to the GP2 Asia Series, by replacing Chris van der Drift (racing for A1 Team New Zealand at their home round of the 2008–09 A1 Grand Prix season at Taupo Motorsport Park) at Trident Racing for the third round of the season in Bahrain.

[3] Vallés and van der Drift would later team up to be the drivers for Epsilon Euskadi in the 2009 World Series by Renault season.

Additionally, Vallés has begun a sportscar career in 2008 with Epsilon Euskadi by driving in the 2008 24 Hours of Le Mans and the 2008 1000km of Silverstone.

On 3 February 2010, the Spanish press said that Adrián Vallés could be the partner of Argentine driver José María López in the USF1 team.

On 8 November 2009, Valles clinched the 2009 title with a solid fourth place for Liverpool in the final race of the season in Jarama.