Series boss Frederic Lequien categorically stated that the field would be increased to 40 in the wake of the publication of next year's entry list of 37 cars.
"We will go to 40 cars in 2025, definitely," said Lequein. "I can tell you it is a kind of obsession at the office, but it is really difficult to find the right balance.
"We will not have the capacity to take everyone, because we could have 43, 44, 45 cars in 2025."
Lequien stressed that an increase to more than 40 cars would not be possible.
"When you participate in the WEC you automatically qualify for the Le Mans 24 Hours and at Le Mans we have only 62 places - we have to pay attention to that," he explained.
More than 40 entries in the WEC would reduce the number of cars race organiser the ACO and the FIA could invite from its associated series, the European and Asian Le Mans Series and the IMSA SportsCar Championship in North America.
This year at Le Mans there were 10 automatic entries from the European and Asian series, as well as three nominated by the IMSA organisation.
The ACO has guaranteed 15 grid spots for LMP2 machinery in 2024 following the disappearance of the class from the full WEC championship.
The plan to go to 40 cars was first outlined to Autosport by Pierre Fillon, president of WEC co-organiser the Automobile Club de l'Ouest, in September.
Source: Autosport