Williams silent over Kubica/Sirotkin reports
12 December 2017 – Williams is staying silent over reports that Robert Kubica has dropped out of contention for its 2018 race seat, and that Sergey Sirotkin is now favourite to replace Felipe Massa as Lance Stroll's team-mate.
Williams fielded both Kubica and Sirotkin during the post-Abu Dhabi Grand Prix tyre test at the end of last month, as it continued to carefully assess its options for next season.
Kubica, 33, was making his third outing with Williams, as part of his push to return to Formula 1 after a serious rally accident, which left him with severe injuries to his right arm.
Sirotkin (22), meanwhile, only recently emerged as a candidate, with Williams technical chief Paddy Lowe describing the Renault reserve as an "interesting driver" ahead of the test.
According to Autosport, Sirotkin delivered a stronger performance in the Yas Marina test session, and is now leading the race for the seat, with Kubica no longer in the frame.
Williams, though, is remaining tight-lipped, with a spokesperson telling GPUpdate.net: "We have no plans for any announcement at this stage regarding our drivers."
Sirotkin's manager, Gianpaolo Matteucci, was also unwilling to discuss what he described as "rumours", albeit stating: "Surely Sergey is a strong, talented candidate for that place."
Autosport's report adds that Sirotkin is believed to be bringing £15 million in financial support from Russia's SMP Racing group as part of the package.
Sirotkin placed third over two seasons in GP2 from 2015-2016.