Jenson Button has said that his plans beyond 2016 will be known "soon".
It is strongly rumoured that McLaren-Honda will end their seven-year relationship with the 2009 world champion by replacing him with Stoffel Vandoorne.
Button, 36, has subsequently been linked with a return to Williams.
"I am almost there with my thought process and you will hear about it soon," Button told reporters.
"It will be soon enough. But I'll tell you this: I will probably be back at Spa in 2017."
The championship continues on Sunday with the Belgian Grand Prix.
