Jenson Button has said that he is not so sure McLaren-Honda can be in a winning position as soon as 2017.
His teammate, Fernando Alonso, is already under contract for next year and he says that the target is not only wins but the world championship.
Button's situation is much less clear, with Williams apparently interested in signing him and McLaren clearly wanting to promote Stoffel Vandoorne.
The 36-year-old insists that he is in control of his decision regarding 2017, saying that he needs a more competitive car.
"We have made progress," he is quoted as saying by Auto Motor und Sport. "But you always want more. None of us are happy about where we are. We want to win.
"Every driver here thinks about his position and whether there is a possibility in the future to in. If not, you have to go somewhere else.
"We simply don't have the best car. We're working on it, but whether we can fight at the top next year remains open."
He said that the top 10 in Hungary will be difficult for McLaren, but predicted a strong weekend for Red Bull.
"They have a good chance to win here," said Button.
The race gets underway at 1pm BST tomorrow.
