Romain Grosjean believes that most teams will have a "B-car" in Barcelona which could alter the pecking order.
Spain traditionally marks the first race of the year where teams bring introductions, due to its placement in Europe and the extensive testing that was held there earlier this year.
Haas is set to bring a big upgrade to the race this weekend, with revisions being made to the front wing, floor and other bodywork components.
"You also know everyone's going to bring big updates," Grosjean said. "So it's almost like everyone's going to have a B-car, therefore the standings could be a bit different.
"I think it's important that our updates go in the right direction. It's important, as we know what we can do there. We'll see if we can repeat that and understand where our race pace has gone."
Haas has had a tough opening four races of the year, with team principal Guenther Steiner confirming that the American squad is struggling with the graining phase of the Pirelli tyres.
But Grosjean doesn't think that the tyres will be such a big issue in Barcelona for Haas.
"It's a track with high energy, so I'm not too worried about getting the tyres to work, in theory," he said.
"It's interesting, as we definitely got them to work in winter testing. Going back there and seeing if we can still get them to work will be a good test, because we know the car should be fast there."
With the high amount of running that took place in Barcelona at testing, Steiner says that the upcoming weekend will offer a good comparison to see where Haas' weaknesses lie.
"We have a lot of data," Steiner said. "We need to make sure that everything still correlates after four races and that our upgrade works, as well.
"We're looking forward to it, to see where we compare from our time there in pre-season testing.
"It isn't really that you can go back and compare the first four races, but Barcelona always affords a good point to regroup after the early long-haul races.
"We're back in Europe, we've got upgrades coming, but you've got more to look at with Barcelona because we ran our pre-season testing there."
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Bahrain International Circuit - Winter testing
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