Renault believe Robert Kubica has the pace in compete in Formula 1 but admitted that he only he knows whether his right arm is up the challenge at all tracks.

Earlier this month Kubica covered 115 laps of the Valencia circuit in a 2012 Lotus F1 car.

The test, his first F1 outing since he suffered severe arm injuries in a rally crash in 2011, has raised questions about whether Kubica could have a future in F1.

“I had no doubt on his pace, ever, at all,” Renault’s trackside operations director Alan Permane told Poland’s Eleven Sports.

“I did not know, I don’t think he knew, whether he would be able to drive physically… and, more than that, be able to drive a lot.