Lewis Hamilton is set to receive a five-place grid penalty for Formula 1’s Austrian Grand Prix.
Mercedes has had to replace the gearbox with which Hamilton finished the Baku race a fortnight ago.
As he has not completed six races with it, he will inevitably be penalised.
The FIA also revealed that the team has known about the issue since Tuesday morning.
A note from the FIA technical delegate Jo Bauer said: “The above driver did finish the last race in Baku and this gearbox change was before the six consecutive events expired.
“As this is not in compliance with article 23.5a of the 2017 Formula 1 sporting regulations, I am referring this matter to the stewards for their consideration.
“The team informed the technical delegate about the gearbox change on Tuesday, 04th July 2017, at 11:29 hours.”
Hamilton had been fastest in both Friday practice sessions at the Red Bull Ring.
He comes into the weekend 14 points behind championship leader Sebastian Vettel.