Despite both Ferraris facing grid penalties in Austin, Nico Rosberg admits Sebastian Vettel and Kimi Raikkonen will "still" be a threat come Sunday.
This weekend both SF15-Ts will be fitted with new engines incurring 10-place grid drops for the drivers.
However, with adverse conditions expected to play a major role in the weekend'd proceedings, Rosberg has warned against writing off Ferrari's chances.
"It makes the weekend more simple for us," he told F1i.com.
"But they are still a threat from where they are because with the weather or whatever. It could make it an easier weekend.
"The frame of mind is that there is nothing to lose. I want to win and I have the opportunity to win, so it's a great target to have this weekend and I'm focused."
The Mercedes driver will line up on Sunday's US Grand Prix grid third in the Drivers' Championship having lost the position to Vettel through a DNF in Sochi.
Rosberg insists he is not focused on the battle with compatriot but is rather still chasing first.
"I never thought about finishing third because with my car, for sure, I'm still on for first at the moment and that's what I'm thinking about.
"Even if I know that it's tough, because I am realistic also and I need a lot of luck, but I'm fixed for that until you tell me it's not possible.
"As for whether he's German or not doesn't make a difference."