Kimi Raikkonen had predicted a difficult Brazilian GP weekend for Ferrari after struggling for pace during Friday practice at Interlagos.

The Finn posted the tenth quickest time in FP1 but could only manage 18th quickest in the second session of the day as the F60 struggled through the second sector of the lap.

While Raikkonen admitted that the close nature of the times - with the field covered by less than a second - meant it wouldn't take much to make progress up the order, he conceded that a tough weekend may lie ahead for the Scuderia.

"I'd say this Friday was not too different to others we have experienced this season, especially in recent races," he said. "It's all very close so it will only take a small step forward to climb back up the order, but we are definitely facing a difficult weekend. The tyres suffered with a bit of graining, which made itself felt especially in the second sector, but I believe that, as often happens here, once the track rubbers in, the situation will improve."

While Raikkonen's day didn't go to plan, things were even worse for team-mate Giancarlo Fisichella, who stalled exiting the pits in FP2 and ended up bottom of the times as a result.

The Italian admitted afterwards that a mistake-free performance would be key if the team was to make it past the first stage of qualifying as he took struggled in the second sector of the lap.

"Eighteenth and twentieth places in FP2 is not a result we can be happy about but, to use a footballing expression, it's all looking very tight, as it has been in fact for much of the year," he said. "On top of that, we are also working a lot for 2010 which makes it even harder to understand precisely where we stand compared to the others.

"We are really struggling in the second sector, where what counts the most is aerodynamic downforce, an area in which the F60 does not really excel. Tomorrow, it will be vital not to make the slightest mistake to try and get a good qualifying result: here it will only take a tenth or even less to fail to make it past Q1."