Dietrich Mateschitz on Tuesday said Red Bull will let Sebastian Vettel go if the new world champion wants to switch to a rival team.
Since securing the 2010 title, German Vettel has been quoted on numerous occasions admitting he would like to one day race for fabled Ferrari or Mercedes.
The 23-year-old is under contract only for 2011, while the precise terms of his 'option' for 2012 are not definitively known.
"Whether we 'fear' losing him is not the terminology we would use," Red Bull mogul Mateschitz is quoted by SID news agency.
"As long as Sebastian is comfortable with us and has a winning car, he will probably not really think about going elsewhere."
But the Austrian billionaire acknowledged Vettel's recent musings about the sport's famous marques.
"If he tells us one day he wants to go to Ferrari or Mercedes, we would have to understand," said Mateschitz. "There are more mothers with beautiful daughters -- we would let him go."
Meanwhile, Mateschitz insists Vettel's teammate Mark Webber will enjoy absolute equality in 2011, after the Australian said recently he foresees a longer tenure with the energy drink-owned team.
"Mark's personality is different but he is as good as Sebastian. They are both excellent warriors who can both win the war," he added.