Formula 1 is "in a very fragile state" as a result of the coronavirus crisis and needs big changes to survive, McLaren boss Zak Brown says.
"This is potentially devastating to teams, and if [it is devastating] to enough teams - which doesn't have to mean more than two - then very threatening to F1 as a whole," he said.
Cost-saving plans will be discussed at a meeting of F1 bosses on Monday.
But the teams are divided over how best to safeguard the sport.
Brown, speaking in an exclusive interview with BBC Sport, believes the $175m (£143m) budget cap, scheduled to come into force in 2021, needs to be lowered significantly, or the sport risks a potential disaster.