Haas boss Guenther Steiner is sure the team's dramatic downturn at the Mexican Grand Prix was just a blip, saying the team "didn't get stupid over the past two weeks".

Haas endured a frustrating U.S. Grand Prix in Austin but Romain Grosjean still scored a point with a 10th-place finish which looked unlikely earlier in the weekend. The team then got off to a slow start in Mexico, with limited running during Friday practice resulting in a disappointing showing in qualifying as neither driver made Q2.

Grosjean labelled Haas' performance "unacceptable" during the weekend, which saw the team change the floor of his car and continue to struggle with its brakes. Despite those issues, Steiner thinks the lack of performance came from the slow start to the weekend.

When asked if Haas needed to change anything to prevent a repeat at the Brazilian Grand Prix, he replied: "No, we just need to do a good job, we don't need to change anything. We won't change any parts and after speaking with the guys we just need to keep focused as we know we are able to do it. We didn't get stupid over the past two weeks we just need to have a smooth weekend."

Steiner refused to make excuses for the result, which saw Grosjean finish in 20th, one place behind teammate Esteban Gutierrez.

"We could not get the balance of the car, we were all over the place. We couldn't get tyres to work we were out of the window. We just didn't perform this weekend. We have to be honest with ourselves and say we didn't do a good job this weekend starting on Friday.

"I was hoping we could regroup on Saturday but you saw our qualifying it was appalling. We just need to get our act together over the next two races because we know we can to do as we got into Q3 just two races ago. We will try hard in the next race."

Steiner is hoping Haas can break the habit of a messy Friday after running into problems at the last two races.

"We need to work on going out on Fridays and actually practice and not spend half the time standing in the garage because that is the worse bit as we don't learn. Here we had one car down in FP2 and then we tried to do all the work on the tyres with the other car and you can't do it all and then you don't get any set-up work done. That is our biggest handicap at the moment that in the last two races we didn't have a clean Friday and Saturday."