But Williams has said she will not let McLaren or Button's lack of news dictate what her team does for 2017.
"We will own our driver line-up decision, and I am not sat here waiting for [McLaren chairman] Ron Dennis to make his decision or for Jenson to make his decision," she said. "It it is not about what other people are doing. I am not going to be waiting around because that is just not the right mentality for a team like ours to have."
"It would be a great story, but he has to make the right choice for him, and we have to make the right choice for the team," she added.
Jenson Button made his Formula début with Williams in 2000, scoring 12 points and finishing eighth in the championship. He was set to return to the team in 2005 and 2006 but after contractual disputes he stayed at BAR, which became Honda and later Brawn where he won the world championship in 2009.
Bahrain International Circuit - Winter testing
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