Michael Schumacher has downplayed Mercedes' chance of success at the Spanish GP, saying the track does not "fully" suit his W03.
With Nico Rosberg having claimed the victory at the Chinese GP, Mercedes were not able to put in a repeat performance at the next race in Bahrain.
Rosberg finished fifth while Schumacher fought back from his lowly P22 on the grid to take 10th place.
The team has been hard at work since Bahrain, taking part in a three-day test at Mugello which yielded promising results for the Brackley-based outfit.
And although Schumacher says the test was positive, the German has downplayed his team's chance of success in Spain.
"After completing our testing programme in Mugello, we are now heading to the start of the European season in Barcelona next week," Schumacher said.
"The positive thing about the test was that we could really concentrate on the developments we were aiming to work on. This should give us a good basis for further developments, even if maybe not for the next race to come.
"Barcelona is a track we have driven extensively on, and this is why we know that its characteristics do not exactly play fully into our hands.
"But then, we will definitely go there and try our best and at the same time keep on working for the things to come."