McLaren driver Fernando Alonso may need to change his engine in this weekend's British Grand Prix, Honda has revealed.
Both Alonso and Jenson Button were given 25-place grid penalties in the Austrian Grand Prix after having used their fifth power unit of the season.
Alonso retired from the race before the end of the first lap when he was involved in a dramatic crash with Kimi Raikkonen.
As as result of the accident, Alonso's engine may have been damaged and will likely need replacing.
The team said, however, that it will revert to an old power unit in order to avoid a grid penalty.
Honda boss Yasuhisa Arai said Button's engine was still under investigation after it had a sensor failure at the Red Bull Ring.
"We have since completed thorough checks of both power units back at the factory, and we believe that Fernando's power unit has sustained damage from the accident, and it may be necessary to change the engine," said Arai.
"As for Jenson's power unit this weekend, the issue is still under investigation.
"Honda is not looking to put any hardware updates in place for the British Grand Prix, but we will optimise the power unit setting to the updated aero parts planned on the chassis."