The new Haas F1 team has the resources to quickly become competitive in their debut season in the sport, according to Sauber's Felipe Nasr.
Haas - whose engines are supplied by Ferrari and are thought to have a sizeable budget - performed well in the first stint of pre-season testing, recording 281 laps over four days in Barcelona this week, with Romain Grosjean's front-wing failure on the first day serving as their only problem.
Team principal Guenther Steiner said the performance exceeded their expectations.
By contrast, Sauber - also supplied by Ferrari - have endured financial problems in recent years and will not run their 2016 car until next week's final test at the Circuit de Catalunya.
And with the season due to begin in Australia on March 20, Nasr said of Haas: "With the resources and financial side they have they can catch up very quickly, they can develop very quickly.
"It's difficult for a new team to start a season in F1, to get the operations side correct, to get everything smooth, but I'm sure with time they will be very competitive."