Robert Kubica has completed a private test day with Williams at Silverstone, as the team continues to evaluate the prospect of hiring the Pole for the 2018 Formula 1 season.

Kubica piloted the 2014-specification FW36 on Wednesday. The team has not disclosed any information regarding the number of laps completed or lap times posted, albeit describing the day as ‘successful.’

Kubica’s promising F1 career was curtailed in 2011 when he suffered life-changing injuries in a rally accident. Limited movement in his right arm has significantly hampered his chances of a return to the category prior to this season.

Back in June, Kubica completed a private test for Renault at Valencia, where he drove the Lotus E20 – the Enstone squad’s 2012 challenger. In July, Kubica piloted 2017 machinery for the first time, driving for Renault at the Hungaroring during the in-season test.

After Renault hired Carlos Sainz Jr’s services for 2018, Kubica’s short-term contract with the team ended. Williams has since developed an interest in his services and continued his evaluation.

Kubica is believed to be driving the FW36 again next week. The team will test both Kubica and current reserve driver Paul Di Resta – who is also a candidate for the 2018 drive – at the Hungaroring.

While this has been pitched by some sections of the media as a shootout for the Williams seat alongside Lance Stroll for 2018, chief technical officer Paddy Lowe downplayed the significance of the evaluation.

“We’re considering quite a large range of which they are only two possibilities,” he said. “Of course Felipe [Massa] is very much in the frame – very, very high on our list of possibilities.

“But we owe it to ourselves to take a look around and see what could be the best option for the team going forward.”

It is suspected that the team is also evaluating the prospect of hiring Sauber incumbent Pascal Wehrlein to partner Stroll.

Signing Wehrlein would, however, conflict with the terms laid out by title sponsors Martini, who require one of the team’s two drivers to be over the age of 25 for commercial purposes.