Artem Markelov made a one-off return in Monaco as a replacement for Jordan King at MP Motorsport, who was competing in the 2019 Indianapolis 500 with Rahal Letterman Lanigan Racing. After collecting twelve penalty points on his racing license for incurring three Virtual Safety Car infringements during the Paul Ricard feature race, Mahaveer Raghunathan was banned from the series for the Red Bull Ring round. Raghunathan's MP seat was filled in Austria by 2018 Indy Lights champion and 2019 IndyCar Series driver Patricio O'Ward.