Haas team boss Guenther Steiner expressed doubt about whether Formula One's plan to host six sprint races in 2022 would go ahead, with the top teams demanding an increase in the sport's cost cap.
Formula One trialled the sprint-race format at three events last year, with qualifying brought forward a day to Friday and a 100 km race held on Saturday to decide the grid for Sunday's grand prix.
The sport had planned to roll out the format across six events this season.
"I don't know exactly what is happening," Steiner said in a virtual press briefing on Friday, shortly after the U.