China - Daniel Ricciardo admitted that Red Bull's new chassis is not yet a match for Mercedes and Ferrari, although his boss Christian Horner says upgrades in China are "looking promising".
Ricciardo denied that the big problem with the Red Bull is the loss of a 'trick' suspension system.
'Pushing for upgrades'
He mentioned: "I don't think so," he said in Shanghai and the team doesn't think so.
"It seems to me, and I think it's true for Max (Verstappen) as well, that we can't attack the corners as aggressively as Ferrari and Mercedes can."
But he also said a major upgrade from Renault will help, even if the scheduled introduction date is not until June's Canadian grand prix.
'Make it happen'
Ricciardo added: "It would be nice if we get it at least the race before, but if we get it in Canada, we get it in Canada. But you always want to make it happen as soon as possible."