Formula 1 boss Stefano Domenicali on Wednesday called on drivers, including the outspoken Max Verstappen, to “be respectful” of the sport but said changes to this year’s new power unit regulations needed to be made.

The Dutch four-time world champion has been the most vocal of the drivers criticizing the new regulations concerning the hybrid engines, whose electric power management has posed problems for the drivers in the opening three races of the season.

Verstappen called the new style of racing “a joke” after the Chinese Grand Prix and has hinted he will take a break from F1 in 2027 if it remains the same.