Berger says Renault do not have resources to fight Mercedes

Gerhard Berger, grand prix winner and former Toro Rosso co-owner, has backed Red Bull in blaming Renault for not being up to the job of challenging Mercedes at the top of the Formula 1 pecking order.

"I am not at all surprised," said Berger, when asked about Renault's struggle to match the pace of Mercedes and Ferrari in F1's new 'power unit' era.

"Their factory is outdated. Mercedes has three times as many engineers and invests at least three times as much money," added Berger.

Red Bull have yet to win a grand prix this season, which has seen them plagued with engine issues and relegated them to mid-pack.