Despite being quickest in the dry on Friday, McLaren insist they are not worried about the threat of rain hampering their chances in Brazil.
Friday's action took place in hot dry conditions with Lewis Hamilton setting the pace with a 1:14.026. That put him 0.274s up on Red Bull's Sebastian Vettel, who many believe will be McLaren's main competition this weekend.
However, rain could change the look of everything as heavy rain is forecast for Saturday afternoon through into Sunday's 71-lap grand prix.
McLaren sporting director Sam Michael, though, says he's not worried.
"Last time in the wet we were quite fast, so that is our last data point," he told Autosport. "So, we changed two or three things after that and hopefully those changes means we can be quicker in those conditions.
"But until you run in the wet you don't know. You can always come away thinking you are really good in the wet, and you have a bad race again and it changes."
Pressed as to what he would prefer, Michael said: "I don't mind, to be honest, I am pretty neutral on it.
"Coming first and second against Red Bull and Ferrari would be pretty tough, and the weather can go either way on you. We don't mind."