De Gerus drove in the French F4 Championship from 2018 to 2019. In his debut season, he took part in the Junior category, finishing runner-up to Théo Pourchaire with four wins and 16 podiums. In 2019, De Gerus competed in the full championship, where four wins, including one at the Pau Circuit, helped him to second in the standings.[2][3]
FIA Motorsport Games
De Gerus represented Team France and the FFSA at the 2019 FIA Motorsport Games Formula 4 Cup where an Olympic style competition takes place with different categories of racing. De Gerus was driving in the Formula 4 Cup. After qualifying De Gerus was in 9th, just over 2 seconds off the pace. For the qualifying race he slipped back one place meaning Team France would start in 10th behind Team Russia. The race itself saw De Gerus finish fifth.
Formula Renault Eurocup
In January 2020 it was announced that De Gerus would compete in the Formula Renault Eurocup for British team Arden Motorsport alongside Alex Quinn and Ugo de Wilde.[4] While his teammates both finished inside the top ten in the standings, de Gerus would have a more difficult campaign, with only three points finishes seeing him end up 17th in the championship.
In February 2022, it was announced that De Gerus has joined Duqueine Team for the European Le Mans Series campaign, racing for the French outfit alongside Richard Bradley and Memo Rojas.[7] Following three rounds, where the team scored a best finish of sixth at Imola, de Gerus quit the series.
Having been upgraded from silver to gold-ranked status by the FIA, de Gerus returned to the ELMS in 2023, pairing up with José María López and Vladislav Lomko at Cool Racing.[9][10][11][12] The season started well, with de Gerus taking his maiden pole position in sportscars at Barcelona.[13] Despite another pole scored by López at the following round, the team would struggle to achieve results throughout the year, with the best finish being a lone podium in Belgium, which came about after a chaotic race in the LMP2 class. The trio ended up sixth in the standings.
Alongside Lomko and Simon Pagenaud, the Frenchman drove for Cool in the Le Mans 24 Hours, though the race would end prematurely as de Gerus crashed at the Porsche Curves during the night.[14][15]
2024
For the 2024 season, de Gerus remained in the ELMS, moving to IDEC Sport and driving alongside Job van Uitert and Paul Lafargue.[1] After three successive fourth places, de Gerus and van Uitert finished third at Spa, moving up to third place in the standings.[16][17] However, a crash caused by the #55 GT Ferrari of Duncan Cameron forced the Frenchman to retire, leaving the team out of the title hunt.
After van Uitert qualified second at Le Mans, de Gerus helped IDEC towards its first podium at the event, finishing third.[18]
Personal life
De Gerus has been acting as a mentor to Belgian driver Lorens Lecertua, the 2023 champion of the Alpine Elf Europa Cup.[19]