Paul di Resta says Canada will provide the best indication yet of Force India's potential

Despite two double points finishes (Malaysia and Monaco), Force India is currently languishing eighth in the constructors standings, 13 points behind Sauber and 16 behind Williams.

However, di Resta remains upbeat about the potential of the Force India, and expects this weekend's Canadian Grand Prix to prove the VJM05's potential.

"It wasn't a secret that we struggled at the beginning of the year compared to what we first thought, but we rapidly moved on," he said.

"We brought a good update to Barcelona and we brought that forward. [In] Monaco [it] was difficult to understand that much more, but here will give us a better indication of what to expect for the forthcoming races.

"We feel we are a bit behind Sauber and Williams at the moment and to overcome them we need to do the maximum job in the races, and that is what we need to do this weekend."

Di Resta is also confident that Force India can continue developing its car well into the season, just as it did in 2011.

"We need to understand the car a bit more in terms of upgrades, that is what we are trying to achieve. I have every confidence team will achieve that - last year our development rate went very high from mid-season and I hope we can do that again.

"I don't think we are getting the maximum out of the car yet."