However, Prost does not see this as an issue and he told Ouest France newspaper: “I don't think it's a problem.
"It's more about the drivers.
“With Toro Rosso, Red Bull has managed to have Vettel, Ricciardo, Verstappen, so we may have a handicap in relation to that.
"But for me the real advantage is not for the factory team, but those who benefit like Haas or Alfa Romeo,” added Prost.
Renault finished fourth in 2018 and with the signing of Aussie Ricciardo are looking to go to the next level.
"Chassis-wise, I do not think we can be at their level yet.
“But on the engine side, we have no fear.
"I think if they (Red Bull-Honda) are fast but not necessarily very reliable, we'll see what happens.
“We aim to get closer to the best, and that is not done by focusing on Red Bull," the advisor said.