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
Jacques Villeneuve has delivered a blunt reality check to championship leader Kimi Antonelli, cautioning the…
Lewis Hamilton enjoyed a highly productive weekend in Montreal, but while his execution and Ferrari’s…
Alpine F1 has unveiled a headline-grabbing commercial shake-up, confirming that luxury fashion powerhouse Gucci will…
It was an inglorious moment for Michael Schumacher on this day at Monaco in 2006.…
The internet has officially lit the match, and Ferrari’s first-ever all-electric offering, the $640,000 "Luce”,…
For Mick Schumacher, the Indianapolis 500 was never going to be just another race weekend.…