Kimi Raikkonen says he endured a 'difficult day' in Sochi as he struggled to make his tyres work in free practice for the Russian Grand Prix.

The Finn arrives in Russia eager to make up for a disappointing Chinese Grand Prix when he was spun at the first corner by Ferrari team-mate Sebastian Vettel and would end the day fourth quickest, but half a second slower than his Scuderia counterpart.

Though unhappy with his day, Raikkonen remains confident he can bounce back ahead of qualifying .

"It was a difficult day," he said. "Nothing seemed to work as well as I wanted. One of those days struggling to make the tyres work and making sense out of the set-up. Apart from that everything was more or less okay.

"On my side I think we have to work because the other car didn't run. I didn't get any good proper laps, but this is a practice day. I am sure we will find something tomorrow."

Discussing the revised engine, with which Ferrari has used up three tokens updating, Raikkonen said it was tough to gauge if it was an improvement.

"Comparing a new engine to the same (old) engine is very difficult to say. It feels different in different places and different days. It works well, and we wouldn't use any new parts - engine or any other - if we don't think it is a good thing."

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