The global sportscar series had been set for major changes in 2018, including an increase of the top hybrid subclass to 10MJ (up from the current level of 8MJ), an increase in the maximum number of hybrid systems to three, and further reductions in fuel flow.

However, following a meeting between Porsche, Toyota, ACO President Pierre Fillon and FIA Endurance Commission President Sir Lindsay Owen-Jones, it has instead been decided to abandon these changes and maintain stability in the LMP1 rulebook for another three seasons.

A statement from WEC said that this decision "will be put before the FIA World [Motor Sport] Council meeting in two weeks for approval."

It also confirmed other cost-saving measures to be put in place next season, including limits on staff headcount, the number of aero kits used in a season, wind tunnel time and testing days.

The u-turn is likely to have been brought on by last month's announcement of Audi's withdrawal from endurance racing, which leaves the LMP1 grid with only two manufacturers for the foreseeable future, plus a sole car from privateer entrant ByKolles.

A new LMP1 entry, however, was recently announced by Russian firm BR Engineering, which is working alongside Dallara and SMP Racing to produce a non-hybrid car to race in WEC in 2018.