May 13 (GMM) The leading men at Red Bull's two formula one teams are safe in their jobs, according to Dietrich Mateschitz.

The energy drink's billionaire mogul told Austria's Salzburger Nachrichten that he is happy with the performance of Franz Tost and Christian Horner.

Austrian Tost and Briton Horner respectively head the two Red Bull-owned F1 teams, Toro Rosso and Red Bull Racing.

"Regarding Tost, for me there is no discussion -- the same for Horner," he insisted.

"I have never doubted either of them even for a second," the Austrian, who turns 68 in a week, added.

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