Kamui Kobayashi reckons Sauber could be in for a good result at Barcelona having made improvements to their C31 in testing.
Kobayashi and his team-mate Sergio Perez were in action at Mugello this week, taking part in a three-day in-season test.
And although did have a few issues, on the whole the team has spoken very encouragingly about their performance.
So much so that Kobayashi reckons they could be in line for a good result at next weekend's Spanish GP.
"At the Mugello test I definitely had the feeling our new update to the car is a step forward for us," he said.
"This is good, of course, but only at the Barcelona circuit will we be able to tell how much of an improvement it really is.
"Not only because testing never allows for proper comparisons to the competition, but also because the Circuit de Catalunya is special.
"It has everything - fast corners, medium speed corners and slow corners. Although everybody knows that track so well, it is very difficult to get the set up right there.
"But, in turn, if you really manage to get it right there this normally means the car can be fast on other circuits as well.
"It will be a challenging weekend for us drivers as well as for the car and the engineers, and I am very much looking forward to going racing again."