Herta, previously a front-runner in the US-based Indycar championship, moved to Formula 2 this year with the intention of preparing himself for F1. Antonelli is one of two drivers to miss media day with an illness ahead of the upcoming Formula 1 events.
The driver currently sits 19th in the standings with a best result of fifth place after a season that has not gone well.
The only way he could be stopped from tying up the title is if one of Russell and Hamilton wins.
We will continue to monitor the situation and provide updates if necessary."Herta, previously a front-runner in the US-based Indycar championship, moved to Formula 2 this year with the intention of preparing himself for F1.
However, Cadillac feel he has shown more potential in his F1 outings, which also include a number of runs in cars from previous years.
His season has not gone well and he is currently 19th in the standings with a best result of fifth place.
Antonelli is one of two drivers to miss media day with an illness.