Robert Kubica has finally admitted that his F1 career could be over and that he may never return to a top-level singer-seater machine.

Kubica saw his career put on hold over two years ago when he was involved in an accident while competing on the Ronde di Andora Rally in Italy - sustaining serious injuries when an Armco barrier pieced the cockpit of his Skoda Fabia.

Having undergone numerous rounds of surgery on his injuries, Kubica is making his return to competitive action this year on the rally stages, with Rally Portugal this weekend marking his first outing in the WRC2 category of the World Rally Championship.

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Kubica has already shown his speed on a number of smaller national events and produced a star driver on the European Rally Championship event in the Canaries before crashing out, and he admitted that his future may lie more in rallying than in F1.

"When you work and do everything to become an F1 driver and you are in F1, and I could say quite an established driver, and then from one day to the other your life is gone - it is not easy," he said in a video recorded during his pre-event test for Rally Portugal this weekend. "Of course I would like to come back in F1, but I know that it might not happen. There are some things that are out of my control, and that's more difficult.

"Rallying I think will help me get back to the sport and it will definitely keep my head up and will keep me busy. Rallying is not just about driving but there's a lot of preparation so I will spend a lot of time around the rallies and in the car. That's good and something I was looking for."

Kubica will drive a specially-adapted Citroen DS3 RRC for his WRC2 campaign having received dispensation from the FIA to make changes to the car to make it easier for him behind the wheel.

"We had permission from FIA, who I would like to thank, for a pad on the left side," he said. "It helps me because like this I can always keep my right arm on the steering wheel, and with my limitation it helps me a lot to drive safer.

"I would say I'm not really limited when I'm driving, it's more outside of the car that I'm more limited."