Kimi Raikkonen has yet to win a race for Lotus this year, but believes he can maintain his title bid if the team raise their game with a big step forward for the final six races of the season.
The Finn is currently third in the title chase and hopes he can stay there or improve in the flyaway events that take Formula One to Japan, South Korea, India, Abu Dhabi, United States and Brazil in eight weeks during October and November.
"I think it's very difficult to say, if I can take the title like this," he said.
"There are too many things that could happen over the next few races. I guess if you look at it mathematically, then yes, I could, but personally I feel you have to win at least one race to make sure you are world champion.
"There would have to be some big dramas if I were to take it from Fernando (Alonso) or Sebastian (Vettel) without winning a race so all I can do is keep moving forward and trying to win.
"That's all I set out to do anyway, every time I step into the car. Obviously, we have to make a step forward from Singapore, where we were nowhere, to be fighting for top places.
"It's impossible to predict how our car will go in the next races. We have to wait until Friday practice to decide how to approach the race... So we need a step forward now."
Former world champion Raikkonen finished sixth in Singapore after struggling with his set-up all through the weekend.
He stressed that set-up will have to just right for the Japanese Grand Prix at Suzuka next weekend or he and Lotus can kiss goodbye to their title hopes.
"We should get some new parts and setting up the car the way I like it to be depends on the weather and on the circuit," said Raikkonen.
"We know the speed is there in our car, we just have to find the right set-up to maximise it every time.
"We give it our best shot to be on the podium, but the races are going to get more and more difficult with other teams constantly pushing with new development parts."
Raikkonen, champion in 2007 when he was with Ferrari, is currently 45 points behind championship leader Alonso of Ferrari in the title race.
