The 24-year-old Briton last contested the championship, then known as Formula Renault 3.5, back in 2014 as a full-time driver for the Arden squad.

Since then, he has been a regular in the Japanese Super Formula championship, where he has yet to score a point in 14 starts with the Kondo Racing team.

Buller also made an appearance in European Formula 3 earlier this season, joining Carlin for the Norisring round in place of an injured Zhi Cong Li.

The Northern Irish driver occupies the seat at RP alongside Vitor Baptista that has been occupied variously by Johnny Cecotto Jr, Artur Janosz and Marco Bonanomi so far this season.

Bonanomi scored a double points finish in the car in the most recent round of the series at Spielberg.