Honda admits it may be forced to replace Fernando Alonso's engine as a consequence of the damage sustained in an accident at the start of the Austrian Grand Prix, while the cause of Jenson Button's retirement is still being investigated

Alonso's McLaren was involved in a collision with Ferrari's Kimi Raikkonen on the opening lap at the Red Bull Ring, leaving the MP4-30 with substantial damage.

However, the scale of that damage could well force McLaren undergo yet another change of Honda power unit on Alonso's car for the Silverstone race.

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"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.

As for Button, which retired after just two racing laps in Austria on a weekend that saw him also incur 25 positions worth of penalties for component changes, the reason for his exit is still being considered.

"As for Jenson's power unit this weekend, the issue is still under investigation."