Haas team principal Guenther Steiner has said Ferrari, Mercedes and Red Bull are in a league of their own and "fears" they will be all season.
The aforementioned trio have already pulled out a decent gap to others in the Constructors' Standings and Steiner believes they will continue to move further and further away from the rest.
"The big teams, especially Mercedes and Ferrari – I think Red Bull is a bit behind – are pretty much ahead of the rest," Steiner said via the official F1 website.
"The four midfield teams are pretty close together. But yes, there is a significant gap to the big three – take the qualifying times, multiply the gap by the number of race laps and there you are.
"Will that change? I hope so – but my fear is that it will stay that way for the whole season."
Steiner, though, was upbeat on Haas' prospects for the 2017 season and will take another major step forward in Spain.
"I don't know what the other teams are doing, but we have a good plan," he added.
"In reality I think we are in the range of our midfield opponents in terms of quantity – then, of course, you have to make sure that the quality also delivers.
"We will have a substantial upgrade for Barcelona – and the next step is still in the wind tunnel.
"Once we find the gains we will start producing. There is a good plan in place. And of course bits and pieces we will bring at any other race."