Sebastien Buemi says he is expecting to hear whether he has got a Toro Rosso drive soon after this week's testing shoot-out, as he believes the team want to use their 2009 race drivers for the remaining winter tests.
The GP2 race-winner and Red Bull test driver is being evaluated alongside current Toro Rosso driver Sebastien Bourdais and former Honda and Super Aguri man Takuma Sato at Catalunya this week.
"We expect a decision soon," Buemi said. "For the team it's really important to make a decision and to try to have a test before Christmas with the proper drivers for next year.
"But up to now I don't know anything. I just try to do my best, it's the only thing I can do."
The Swiss driver said he was trying to put the possibility of a 2009 seat out of his head and stay focused on performing well at the test.
"At the moment, I just try to concentrate on the job because this is the most important thing," he said. "If I do a good job, it could be good (for 2009)."
Regardless of the outcome of the shoot-out, Buemi felt he had made a strong contribution to Toro Rosso's preparations for the 2009 rules.
"Really happy with how the day went," he said. "We tested a lot of things with the slicks and low downforce.
"It was the only thing we could test, because we still don't have any parts for next year, but it was really positive and we're quite happy with the results."
Buemi is the only one of the three rivals for the drive testing for the full three days this week, with Sato and Bourdais each running for just one and a half days.