Last week, the beleaguered British team did not outright deny speculation its situation is so bad it had been in contact with Mercedes about a last-minute engine switch.
"I don't know, but for me it would be an incredible thing for formula one and so I find it hard to believe."
But Sainz insisted: "I have enough things to worry about myself, but I wish him the best because if I can't win, I want him to win.
"They have had a very hard winter, but last year they started behind us and ended up ahead," he added.
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