Red Bull also responsible for lack of performance - Prost

Former quadruple F1 World Champion Alain Prost believes the Spanish Grand Prix offered ample evidence that Red Bull's woes this season should not be pinned exclusively on the team's Renault power plant.

Both Daniel Ricciardo and Daniil Kvyat were both beaten in qualifying in Barcelona by Toro Rosso juniors Carlos Sainz and Max Verstappen, a fact which demonstrates that the qualities of the team's RB11 chassis may also be called into question.

"Let's not forget that a car's performance is not dependent only on the engine, but also on the chassis, " commented the Frenchman and Renault ambassador. "It's not a black and white situation, like Toro Rosso, which is using the same engine, shows us."

Prost doubted that Renault's brand image had suffered as a consequence of its ongoing difficulties to master F1's current hybrid power plant technology.

"It's obviously not positive but I don't believe it has a negative bearing on the Renault brand. We must be aware that these things happen in motor racing; you can be dominant and then lose your edge. One must accept this. There were perhaps more problems than imagined, but the rule changes were massive at a time when Renault and Red Bull also had their fight for the championship to deal with."

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