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Robert Kubica looks to have secured the second race seat at Williams for 2019.
The Pole was also reportedly weighing up a long-term Ferrari test role, but a British publication claims Kubica has instead accepted the offer from Williams.
Close kept secret
He claims he is "close to a decision" about his future.
READ: Robert Kubica admits Ferrari test role possible amidst Williams seat speculation
But boss Claire Williams said the team has in fact "chosen the second driver, but for now we do not want to spoil the surprise".
However, Williams is believed to have scolded the journalist who reported that Kubica is definitely set to be George Russell's teammate.
"The journalist was cornered in the media centre by the Williams press officer," Poland's Eleven Sports claimed in Brazil.
Williams is dead last in 2019 and will now lose top manager and engineer Rob Smedley to a rival team.
"Hopefully I leave the team in better shape than it was in before," he said at Interlagos.
"I definitely want to stay in formula one on the technical side. I'm lucky because I'm already talking to people and that's a fortunate position to be in," Smedley added.