Flavio Briatore says it’s a shame Robert Kubica will not make a sensational return to formula one in 2018.

A source close to Kubica, the former BMW and Renault driver who almost lost his arm in a 2011 rally crash, admits the Pole’s comeback bid is now “game over”.

Other sources claim Williams has definitely signed up Sergey Sirotkin, the Vladimir Putin-linked Russian driver.

“I’m very sorry that Kubica did not manage to convince Williams,” former Renault team boss Briatore is quoted by Speed Week.

“I have talked to (Kubica co-manager) Nico Rosberg several times and know that everything has been tried, but the Russian has an enormous budget.

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