Adam Carroll will replace Antonio Pizzonia at FMS for the GP2 races at Magny-Cours this weekend.
Pizzonia has only scored one point in the first five races of the season, while Carroll has been racing in the DTM this year after spending two years in GP2.
Carroll won three races during 2005 with Super Nova, but he struggled last year with Racing Engineering.
The Ulsterman opted against competing in the series for a third season when he could not secure a drive with a top team, but FMS have won races in the past.
Carroll has endured a difficult first half of the season in the DTM with Audi, where he is racing for the Futurecom TME outfit run by Spyker F1 team boss Colin Kolles.