Colombia's Tunjo, who won on his fourth GP3 start in 2015 before losing his seat two races later, started the 2016 campaign with Jenzer, only to be replaced in the #20 car by Arjun Maini two rounds in.

Tunjo, who previously won at Spa in Formula Renault 2.0 Alps and NEC championships, will now take over the #19 car that was intermittently occupied by Slovakia's Richard Gonda in the early stages of the season.

Meanwhile, Boschung, the winner of the chaotic sprint race at the Red Bull Ring earlier this year, has confirmed he will vacate the #17 Koiranen car for Spa.

The Swiss driver's absence means Koiranen is set to run only two cars, for Matt Parry and Matevos Isaakyan, having started the season with four full-time entries.