Jean Todt has said that he hopes Formula 1's new engines for 2021 might be adapted for use at Le Mans.
Plans for a 'world engine' were scrapped when the current F1 rules were introduced in 2014, but FIA president Todt says that the 2021 rules are now an opportunity to try again.
"At the moment we have separate engine regulations for every series," he told Auto Motor und Sport. "It doesn't have to be like that.
"The requirements for Formula 1 and the world endurance championship are similar. A Formula 1 engine has to do about 5,000 kilometres, which is about the Le Mans distance.
"Having one engine concept would be attractive to new manufacturers, and it could mean F1 teams can go to Le Mans with their own team, or vice versa."
The 2018 Formula 1 calendar gets underway with the Australian Grand Prix on March 25.