Red Bull team principal Christian Horner says good progress is being made by his team's future engine partner, Honda, and says a large amount of resource has already been invested into the 2019 car.
Despite winning three races earlier this year and competing regularly with Mercedes and Ferrari, Red Bull looks destined to finish a distant third in this year's constructors' championship.
Fed up with a lack of performance and reliability from its Renault power units, Red Bull announced in June that it would switch to Honda next year in the hope the Japanese engine manufacturer would stand a better chance of closing the gap to Ferrari and Mercedes.