Red Bulls future in Formula 1 is uncertain as they look to Le Mans alternative

Red Bull could leave Formula 1 in order to pursue success in the World Endurance Championship alongside Aston Martin if they don't like the rule changes for 2021. 

Red Bull have confirmed that they will stay in the sport until 2020 but their future after that is uncertain. It is thought that they could change to racing Le Mans and drop Formula 1 completely. 

Dr Helmut Marko has revealed to Autosport that "We have an agreement until 2020," 

"As long as there is no engine regulation and no Concorde Agreement, neither Red Bull nor Honda will make a decision.

"However, we will certainly not become dependent again, as we have been in the past when we were begging others and statements and promises were not kept.

"Stop is the option. Or do something else, other racing series."

WEC rules are set to change in 2020 to welcome hypercars into the series. This could open up the door for Red Bull to enter the Le Mans 24 Hours alongside Aston Martin. 

"With the Valkyrie, Le Mans could be an option with hypercar rules. We went through with it, and it's a sensational success," Marko added.

"The cars were all sold out immediately. That's another good pillar for Red Bull Technologies.

"If there was a cost cap in Formula 1, we would have to cut people. We don't necessarily want that. We could then use them in such projects [as Le Mans].

Formula 1 will hope that the rumours of both Red Bull and Ferrari leaving the sport are not true but perhaps rule changes might be made to try and encourage them to stay in the sport.