Additionally, Ricciardo was criticised in a brutal rant delivered by Jacques Villeneuve at the Canadian Grand Prix, who questioned why he was still in F1.
Despite the criticism, the 34-year-old responded with an eighth-place finish in Canada, his best of the season.
Will Ricciardo remain at RB?
Ricciardo was tipped before the season to replace Sergio Perez at Red Bull, if the Mexican failed to perform this year.
However, according to Red Bull boss Christian Horner, he has not done enough to be considered for a promotion, and still has 'work' to do if he wants to retain his RB seat.
“Daniel has had ups and downs this year,” he told Sky Sports.
“He knows he has to perform and he also knows he hasn't done enough to be promoted to Red Bull.
“There is still plenty of time. But Ricciardo will have to work hard if he wants to keep his seat at all.”
Red Bull reserve driver Liam Lawsonis also targeting an RB seat, but has admitted he is willing to look elsewhere if a drive does not become available.