Monisha Kaltenborn has expressed her dissatisfaction with the Sauber team's performance in the United States Grand Prix, despite Felipe Nasr scoring points.

On the weekend it celebrated its 400th grand prix, Sauber endured a tough weekend as the inclement weather conditions hampered its efforts in qualifying to leave Marcus Ericsson and Felipe Nasr 16th and 17th on the grid.

With the two drivers then colliding at the start of the race, Nasr was forced into the pits for a front-wing change, one of five pit-stops he would make over the course of the race due to strategic errors.

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With Ericsson's race coming to an end due to technical problems, Nasr at least made the most of a high rate of attrition to finish ninth.

Despite the points, Kaltenborn says she is 'not satisfied' with the team's performance, while she appears to criticise Nasr in particular by saying a lack of track experience is 'not an excuse'.

"We can absolutely not be satisfied with this weekend. It is not an excuse that one driver did not know the track before and we were not able to run many laps here. Almost everything that should not happen during a race happened. The result is fortunate, but we cannot count just on luck in the future."