Force India have been struggling to find a balance with new tyres, introduced by Pirelli, and Team Principal Vijay Mallya says they are hopeful of finding a solution soon.
"It is going to be a close fight, but the good news is that McLaren still aren't that far ahead. They only scored one point in Monza, so they are definitely catchable," Mallya said.
"We need to perform better ourselves, that's very clear. We're working hard to find more performance, but at the same time we've made it quite clear that we will not compromise next year's programme. It's always a balancing act, but we know what we need to do," the liquor baron added.
"We've got to qualify well to give ourselves the best chance of scoring points. We are still close to McLaren in the championship and we need to make sure we keep a healthy margin ahead of Toro Rosso and Sauber. Singapore can sometimes generate surprises and there's always the risk of rain, so as a team we need to be ready to react quickly and make the most of any opportunities," Sutil said.