Nico Hulkenberg will not defend his Le Mans title next season as the endurance race clashes with Formula 1.
Next season the Le Mans 24 Hours race, which this year Hulkenberg won with Porsche, will take place on the same weekend as the European Grand Prix in Baku.
With his committed to F11 and Force India taking priority, Hulkenberg concedes he won't be able to defend the title.
"I am committed to F1," he said. "That is my main job, my main target here.
"It [the calendar clash] is something out of my hands, out of my control.
"We will have to go with what they decide and accept it, I am afraid."
Porsche are willing – at least for now – to hold Hulkenberg's seat should the F1 calendar change.
"Yes," he said when asked about the prospect, "but there will obviously be a certain cut-off point. I don't know.
"The calendar is there now, it is out. But we know often that the calendar comes out and it gets changed a little bit afterwards.
"I think there will be a cut off point for them as well where they have to confirm their drivers but I think there is still some time there."