Michelin's motor racing Pascal Couasnon has said the tyre manufacturer do not currently have any plans to return to Formula 1 in 2021.
Michelin provide tyres for the likes of Le Mans, Formula E and MotoGP, but have not been involved in Formula 1 since the 2006 season.
The blueprint for the future in Formula 1 has been designed to try attract new suppliers and teams to the sport, akthough Couasnon has yet to see anything to suggest the new rules will look beyond the engine-making process.
"It is not an option as long as there is no change in the regulations," Couasnon told AS newspaper.
"For us, it does not make sense to manufacture 13 inch tyres when these are not seen on street cars.
"It would be different with 18 inch wheels, but it seems to me that the 2021 changes are focused on the engine and the budget.
"The most important thing for us is the technological challenge and to have something to learn from. Otherwise we will not invest."