Kimi Raikkonen says Ferrari is "going in the right direction" ahead of the United States Grand Prix on Sunday.

After Friday practice in Austin, Raikkonen said he had struggled in the opening session before being happier with the set-up of his car in the afternoon. However, while pleased with the progress, Raikkonen also warned that there is "a lot of work to do" if he is to be competitive in qualifying on Saturday.

"The day began with a few difficulties in the first free practice session, in which we concentrated on analysing various aerodynamic components," Raikkonen said. "I did not feel comfortable with the set-up we had and controlling the car wasn't easy. In the afternoon, we made some changes and the handling of the car was definitely better.

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"On the Medium compound, I managed to do a good lap and I think if I had not been held up in traffic, I could have done even better. We still have a lot of work to do before tomorrow's qualifying, but the improvement we saw from one session to the next seems to indicate we are going in the right direction. We just have to continue doing our best."

Engineering director Pat Fry said some of Ferrari's work had been looking ahead to next season and said catering to both Raikkonen and team-mate Fernando Alonso had not been easy.

"Overall, it's been a positive day and we managed to complete our planned programme without any problems, including carrying out some tests aimed at 2015," Fry said. "Obviously, the priority was working on the settings of the two cars, looking at finding the best aerodynamic configuration, working on the power unit control units, so as to adapt them as well as possible to the characteristics of this track.

"It wasn't easy finding the right balance and a set-up that suited both drivers, partly down to the strong winds which had a major effect during the second session. This evening, the engineers will assess the various solutions we tried today. Tyre behaviour is definitely different to the last race in Sochi: this means we can look at different strategies for the race, while we are aware that we are up against extremely competitive opponents."