Mar.5 (GMM) Team owner and boss Vijay Mallya, or another representative of Force India, was missing from Wednesday's meeting of the FOTA alliance in Geneva.
In a press statement, the Formula One Teams Association attached a photo of the gathering, which confirmed the Indian billionaire's team was not represented as final discussions about a blueprint for the sport's future were held.
The statement said "senior management from the FOTA-affiliated" teams had met ahead of Thursday's press conference in the Swiss city.
Many teams, including Renault, Ferrari, Toyota and McLaren had two representatives present, while Ross Brawn - who heads up FOTA's technical arm - was there despite the lack of confirmation about the survival of the team commonly known as Honda.
Christian Horner and Franz Tost both attended, even though their respective Red Bull and Toro Rosso teams are both owned by the energy drinks brand.
It is believed Mallya will be present at Thursday's press conference, where the FOTA proposals - devised with the aid of worldwide market research - will be announced.
Changes to qualifying and the points structure are believed to be on the agenda, as will be the mandatory revealing of more team data including radio transmissions.