Force India deputy team principal Bob Fernley says the in-season tests are proving tough for the smaller teams.

All eleven teams have remained in Bahrain following Sunday's grand prix for a two-day test this week, with only Sauber not running at least one race driver. Speaking exclusively to after the first day of testing, Fernley admitted the four planned tests this year would mean Force India has to ask a lot from its staff.

"It's not easy for a small team because we've got to stretch everybody to the limit," Fernley said. "Especially when you've had a hard three races on the road and another one to go yet, so it's certainly not easy but you've just got to do it, there's no option to it."

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Speaking about the plans over the two days, Fernley said the team is working on some development parts in the hope of being able to challenge for a repeat of its podium performance in Bahrain.

"We've just been evaluating one or two small upgrades that we're thinking of introducing for China really ... General stuff; a little bit of aero, a little bit of other things but nothing specific.

"We've been running reasonably strongly at all races so I don't expect anything less in China. Obviously China is a different circuit and it could also be weather-affected, so we've just got to take it as it comes, but I think we're very capable of maintaining a strong positions."