New Zealand's Brendon Hartley still hasn't had any confirmation about a drive for next season but admits it looks optimistic.
The 27-year-old made his Formula 1 debut in Austin a fortnight ago and impressed again before a blown engine forced him out of the Mexican Grand Prix on Monday.
While it has been extensively reported that Hartley will be offered a fulltime drive with Toro Rosso next season, the man himself insists nothing is done yet.
"I have two races ahead of me, which is an amazing opportunity, in Sao Paulo and Abu Dhabi on top of that I have two more rounds of the WEC as well and we are hoping to clinch the title," Hartley told Radio Sport's D'Arcy Waldegrave.
"If I focus on doing my job and keep the progress then I would say it is positive for next year but there is no point worrying or stressing about things that are out of my control."