Toro Rosso boss Franz Tost believes Carlos Sainz owes an allegiance to Red Bull and should consider himself lucky to be in F1.
As a Toro Rosso-Honda partnership looms following a probable engine supply deal between McLaren and Renault, Sainz could join the French manufacturer's works team as part of a compensation package required by the latter in order to end its contract with Red Bull's junior outfit.
Regardless of the ongoing complex negotiations and their ultimate outcome, Tost would disapprove of Sainz's departure.
"Carlos has a contract with Red Bull which financed his career," the Austrian manager told France's Auto-Hebdo.
"And now that he has reached maturity, we should let him go? Red Bull isn't in the business of forming drivers for other teams.
"What if something happens to one of Red Bull Racing's drivers? This is precisely why Red Bull has two teams in F1."
Tost believes the energy drink company's heavy investment in young talent warrants a return, something obviously lost on Sainz says the Austrian.
"They've invested a lot of money and I don't accept a driver waxing on about how "I want to join another team".
"He should be happy to be n Formula 1, especially as the Toro Rosso is a good car..."
Gallery: The beautiful wives and girlfriends of F1
Keep up to date with all the F1 news via Facebook and Twitter
Kimi Antonelli has found a rather colourful way to mark his arrival among Formula 1’s…
Oscar Piastri has discovered an unexpected downside to a season spent away from Formula 1's…
Oliver Bearman is ready to put some distance between himself and Formula 1 after a…
Lance Stroll’s 2026 campaign has become a frustrating sequence of mechanical setbacks. The Canadian’s Sao…
Maria Teresa de Filippis - motorsport's first female F1 Grand Prix driver - was born…
Daniel Ricciardo has never been short of admiration for Max Verstappen, but the retired Australian…