Daniel Ricciardo says there is 'a bit of work ahead' for himself and the Red Bull Racing team after a difficult start to the Russian Grand Prix was compounded by a suspected power unit failure in FP2.

The Australian's RB10 came to a halt with just seven minutes of the FP2 session remaining, though Red Bull has confirmed it was a practice engine and will not be used again this year, meaning no penalty.

Indeed, it was a tough day all round for both Ricciardo and Sebastian Vettel with the three-time race winner being bumped down to 13th position by the chequered flag on a day that saw Mercedes-powered cars fill six of the top seven positions.

Related Articles

With this in mind, Ricciardo says he has struggled to determine the right set-up on the car around the new Sochi Autodrom venue, adding that he is keeping his expectations relatively modest.

"We are a bit in the limbo," he said. "I'm not quite sure where to go but I think we need to hunt for some straight line speed so we can attack in the race because it doesn't look like we will be on pole at the moment.

"We are definitely further off the pace than we expected. We are lacking in both areas - we tried a bit more downforce, we tried a bit less and we still didn't find an answer -, so we will have a look tonight and see if there is anything else we can adjust.

"I think it will be a bit like Monza - at this stage damage limitation and aim for the top five. We have a bit of work ahead of us."