Ferrari driver Sebastian Vettel says he is sure he will make progress with his SF15-T on Saturday after struggling during Friday's sessions for the Belgian Grand Prix.
Vettel was adrift of team-mate Kimi Raikkonen in the first session and could manage only 10th in the afternoon outing.
However, Vettel was also off the pace in Hungary, before he went on to finish as Mercedes' closest challenger in qualifying and subsequently win the race.
"Today it was not the best day for us, it was a bit difficult to find the rhythm, but for tomorrow I think we can do a step forward: we have to do so, because we don’t want to be tenth," he said.
"I’m quite confident that we can tune up the car, because today I was not entirely happy with it: tomorrow it should be a better day."
Raikkonen, who was fifth, says that Ferrari should be able to improve the minor blistering he encountered with his tyres.
"Regarding the tyres we had had a little bit of blistering in the front, which obviously was not ideal, but not a disaster either, there are many things we can do for this," he said. "Tomorrow we’ll try our best and see what we can do for Sunday."