Max Verstappen says Ferrari's sudden drop in performance is "not strange", instead suggesting it is a consequence of "cheating".
Ferrari have been on pole at the last six races after finding their form over the summer break, but were pipped to pole this weekend for the United States Grand Prix and then fell down the order during the race, seemingly unable to keep up with Mercedes and Red Bull.
Verstappen, speaking to Ziggo Sport after the race, accused Ferrari of cheating with recent claims they are using electrical interference to bypass the fuel flow limit.
"You get that when you stop cheating," said the Dutchman. "It’s [their engine] now being carefully watched, but we have to keep an eye on it."
Verstappen went on to add about Ferrari's performance: "Oh it's not strange", he then added: "well why do you think? You can fill it in yourself" after being asked to explain his comment.
He's not the only one to question their form, with Lewis Hamilton suggesting on Saturday that they'd suddenly lost some straight-line speed this weekend.
“What’s come out this week has been quite interesting to see," he added. "Obviously today I think they’ve lost a bit of power.
"I’m interested to see how that continues and how it reflects in the race."
