Red Bull look poised to agree a new customer engine deal with Renault.
Relations between the parties have improved this year, with Red Bull - rebadging the units as Tag-Heuer - much happier with performance.
Daniel Ricciardo indicated recently that a new deal is "likely", but Auto Motor und Sport says that the two sides are currently talking about price, with Red Bull this year paying a princely sum of €28m (£22m).
The FIA is reportedly pressing for clarity about each team's engine plans for next year within the coming days, given the new rule guaranteeing supply up and down pitlane.
The report quotes Red Bull team boss Christian Horner as saying that a new Renault deal is "99%" likely.
"Renault will continue with us because we are a good yardstick for the factory team," he added.
Red Bull's alternatives appear limited, with Mercedes and Ferrari refusing to offer 2016-spec units for this year and Ron Dennis refusing to give up McLaren's exclusivity guarantee granted by Honda.
