Alain Prost has accused the Alpine F1 team of having "no respect" after his departure was leaked before being made official.
Prost, a four-time F1 world champion, had been the team's special advisor since 2017, serving through the its rebrand from Renault to Alpine ahead of last season.
The F1 website announced the news on Monday, before Prost confirmed it later that day.
In a post to Instagram, Prost said he had turned down an offer to stay at the team rather than Alpine opting against renewing his deal.
"I am very disappointed how this news has been announced today," Prost posted on Instagram.