Williams has announced Robert Kubica and Sergey Sirotkin will drive for the team in next week's post-season test in Abu Dhabi.
The duo will share driving duties with full-time driver Lance Stroll in the two-day test at the Yas Marina Circuit. The test's main purpose is to evaluate Pirelli's new tyre compounds for 2018.
Williams will be able to use the test to further assess Kubica's readiness to return to Formula One -- the Pole is favourite to replace the retiring Felipe Massa, but questions still linger over his fitness and capability to compete in F1 following his arm injury sustained in the Rally di Andora in February 2011.