Jenson Button is expecting to join McLaren team-mate Fernando Alonso and Red Bull pair Daniel Ricciardo and Daniil Kvyat in sustaining a grid penalty at the Austrian Grand Prix.
Button encountered an ignition plug problem during practice at the Red Bull Ring, which limited his running on Friday as he finished down in 18th position.
"Although we didn’t get a lot of running under our belts, we were still able to improve the car quite a bit between the sessions, which was positive," he said.
"It would have been nice to run the car on high fuel to see where we stand though.
"Tomorrow will be tricky, because it’s likely that I’ll get some grid penalties. When that happens, you need a Safety Car in the race to bring you back into the game, so hopefully that’ll be the case."
Team-mate Fernando Alonso trialled McLaren's new front nose but was unable to offer substantial analysis due to a lack of running.
"I had an electrical connection issue in FP1, then some software issues with the gearbox," he said.
"Then, in FP2, we stopped as a precaution after Jenson had a problem with an ignition plug. We have new engine components fitted in the car, so it’s better to run safely today and then fully investigate the problems in order not to have any issues tomorrow.
"That meant we lost some time, and we needed some mileage to get a handle on the new aero package and optimise the performance of the car."