Force India driver Nico Hulkenberg says the outfit will need to adapt quickly across the remainder of the Russian Grand Prix weekend, following a lack of running during Friday practice.
Hulkenberg topped a first session which was reduced to an hour following a track vehicle dispensing fluid on the circuit during the morning, before completing just three laps in a rain-affected second session.
"It's always frustrating when you have a big work plan and you can't go out, but it's the same set of conditions for everyone," he rued.
"Like at Suzuka two weeks ago, we finish Friday without having done much running, but that generally makes it more interesting and unpredictable for the rest of the weekend.
"The next two days are likely to be dry, so tomorrow morning's final practice will be crucial: we will need to learn and adapt quickly ahead of qualifying.
"We will need to squeeze a long run in during FP3 and do the necessary car and tyre set-up exploration. It will be a busy session, but at the same time it could generate an opportunity for us. It's going to be a big challenge for everyone."