The Spaniard insisted the team is not quite as fast as the constructor standings suggest, with the Woking-based team ahead of their power unit provider Renault as they find themselves best of the rest in fourth position.
While the team has got a great start to the 2019 season compared to its rivals, Sainz says that the team has been lucky to pick up as many points as it has done so far.
"We've been executing some good weekends and races," Sainz is quoted by GP Today. "I think we haven't been the fourth fastest car, it's something that we want to be at some point during the year.
"But we are the fourth best team, no doubt about that. We haven't been the fourth fastest car, and I want this team to keep pushing, to not get relaxed and push hard.
"It would be a long season, and we want to score points on pure race pace and pure performance."
His Canadian Grand Prix weekend got off on the right foot despite the downplaying of expectations, finishing FP1 in a respectable seventh position, 1.2 seconds down on the outright fastest time of Lewis Hamilton.