With just three months and seven races remaining in 2010, Christian Klien is not ruling out making an appearance or two on this year's Formula One grid.

After starting its difficult debut season with Karun Chandhok alongside Bruno Senna, both of the Spanish team HRT's original drivers have been rested in order to make way for the well-funded Sakon Yamamoto.

Japanese Yamamoto now appears to be the permanent occupant of Chandhok's old seat, while Senna insists his contract guarantees him the remainder of the season.

But Klien, another of HRT's contracted drivers, remains hopeful.

"It's hard to say," the 27-year-old told the Austrian daily Kurier.

"All four drivers in HRT are equally placed. It depends entirely on the team," said Klien, who has already made appearances in the F110 car this season during Friday practice in Barcelona and Valencia.

"I will try to be in the car as much as possible to accumulate experience," he continued.

Klien, with 48 grands prix under his belt with Jaguar and Red Bull, and also test roles with Honda and BMW, is hoping to be a contender for a full HRT race seat in 2011.

"I get along very well with the team's people and also the boss (Colin Kolles)," said the Austrian, who will no longer be involved in Peugeot's Le Mans programme because the French marque wants its drivers to be focused on sports cars rather than F1.

"I am also speaking with other (F1) teams," insisted Klien.