GP2 drivers Edoardo Mortara and Dani Clos are set to make an appearance in the latest World Series by Renault event at Le Mans after being signed to Tech 1 Racing and Epilson Euskadi respectively.
Mortara, who is currently classified as the second highest-placed rookie in this year's GP2 standings after winning at the Circuit de Catalunya season opener, will compete for Tech 1 Racing as a replacement for Brendon Hartley, who will be returning to the Formula 3 Euroseries.
Clos, meanwhile, has been competing with reigning champions Racing Engineering in GP2 this season, but has struggled to match the pace of team-mate Lucas di Grassi.
Nonetheless, the Spaniard will supplement his experience by joining Epsilon Euskadi for the latest World Series by Renault round at Le Mans, Clos taking the place of countryman Valles, who has prior Superleague Formula commitments.
Superleague Formula has also called away John Martin from the Comtec Racing squad, the Australian being replaced by former British Formula 3 driver Cristiano Morgado.