Sergio Perez fears Force India could be in for a "very painful" season unless their delayed B-spec car is a considerable step forward.
Earlier this week, it was reported that Force India would not be introducing the revised car until after the Austrian GP, round eight of the Championship.
The news came as a massive blow to Perez and Nico Hulkenberg's aspirations as their current VJM08 is down on performance.
The team's deputy team principal Bob Fernley has, according to Autosport, promised a "significant upgrade" with the B-spec but the delay has left Perez frustrated.
"Obviously it is frustrating not to have a competitive car that can bring you into the points with pure pace," said the Mexican driver.
"That makes things really hard, but it doesn't change anything as a driver. You still give it your best possible shot weekend after weekend.
"Obviously, you are in a position where it is very easy to make mistakes, to lose the car as the car is very difficult with degradation.
"From now on, we will have hard races – but it is where we are."
Perez added that unless Force India's B-spec car is a good step forward, the team could be in for a painful year.
"If we make a proper step then we can still have a good year but there will be plenty of races to go after that, a lot of time to recovery, but if we don't make the step we're hoping for then it's going to be a very painful year."