Mercedes driver Nico Rosberg says he has "chosen" to keep believing he can win the championship this year, even if the odds are stacked against him.

Rosberg goes into this weekend's Singapore Grand Prix trailing team-mate Lewis Hamilton by 53 points - more than two races wins - with seven races to go.

The German's title prospects took a major hit last time out in Italy, when he suffered that engine failure two laps from the finish, but despite all that, Rosberg again reiterated on Thursday that he hasn't given up hope.

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"No [the odds aren't in my favour], definitely not," he confirmed, prior to the 13th round in the F1 2015 World Championship, "but I have the chance, so I keep believing or I don't, and have chosen to keep believing because it is going to help for the next couple of races and historically also in sport anything can happen.

"So there are still seven races to go and lots of points and so I keep pushing. With the car that we have it is possible to win every race weekend if I do a good job, which is a great feeling. So I focus on the race weekend and see what Lewis does."

Asked if the pressure is somewhat eased now the gap is so big, Rosberg replied: "I want to win the championship, so take off the pressure? I don't know. The feeling last year in Singapore was definitely a lot better than now because I had 20 something points the other way.

"I much preferred that one."

Meanwhile, after his engine problems at Monza - he had to revert to the old Spa unit before qualifying (the one that let go near the end of the race) - he added that he will have the new spec one here.

"New engine yes, but we are not sure how compromising it will be going forward yet. Most likely a small compromise at least and maybe a bigger one, depending, but we don't know yet," he explained.

"The problem [at Monza] was in the chassis [with the cooling system], so we put in another engine because there was not time enough to sort out that one. And because it was not understood. And still isn't actually fully in terms of the impact," he continued. "And then the one we put in was old, and it did not want to do the last two laps [in the race]. That would have been the end after that, but two laps was too much to ask."

Finally, Rosberg tipped Red Bull to surprise this weekend: "Yes there could be a couple of surprises here. I'm expecting some possible surprises. Red Bull is a candidate. They could be a surprise here because they were quick in Hungary and even Spa they were quick in the corners. So we will keep an eye on them. Ferrari of course as usual. Those are the main two."