Lotus team boss Eric Boullier insists that the Brazilian Grand Prix is the 'last chance saloon' for the Enstone-based as it seeks to secure the best result possible in the constructors' championship.

The team heads to Interlagos having secured fourth place some time ago, but could still overhaul Ferrari for third if results go in its favour in Sao Paulo.

Speaking ahead of the season finale, Boullier admitted that it would be a challenge to get into the top three, but said the team would continue to push hard while third was still mathematically possible.

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"It's the 'Last Chance Saloon' to score points and we want every single one we can get," he said. "We head to the race in fourth position in the Constructors' Championship but with third still mathematically possible. You never know what can happen in this sport, so we're going all out to score everything we can."

Regardless of whether or not the team is able to secure third in the standings, Boullier said he was happy with the way the season had panned out, with the Frenchman paying tribute in particular to Romain Grosjean for the way in which he had improved on track this year.

"There have been many highlights," Boullier said. "Winning the opening race of the season was a fantastic accomplishment; especially compared to the previous season where we'd looked close to victory but kept having it slip out of our fingers until we finally nailed it in Abu Dhabi.

"This year the E21 has been such a superb car and a testament to the hard work of everyone at Enstone. We've been able to sustain our pace and development and were also able to adapt well to the mid-season tyre changes; allowing us to keep punching above our weight relative to the opposition, which has been exceptionally satisfying.

"Our recent run of podium finishes really shows what a fantastic group of people exist at Enstone. To have been able to produce and develop such a car under conditions that are not always perfect is a great achievement. Finally, one of the definite highlights has been how Romain has matured as a Formula 1 driver. He keeps delivering exactly what we want from him and is really a force to be reckoned with against anyone on the grid."