Schumacher, son of the F1 legend Michael, is suddenly dominating the European F3 series, triggering rumours that Red Bull want him for their junior programme and possibly even a Toro Rosso seat.
The 19-year-old admits that he is riding a wave of form.
"After the first win in Spa, something happened. I don't know what," Schumacher said.
However, Marko said that the Toro Rosso rumours are wide of the mark.
"Mick is not on our list," the Red Bull official told Germany's Auto Bild. "We do not have any contact with him at all."
FIA president Jean Todt, a close friend of the Schumacher family, would not mind if Mick's journey to F1 takes longer.
"He is a great driver, but he still has a lot to learn. We have to give him time," he told Sport Bild.
"He's under pressure because the expectations are high."
Michael Schumacher retired from Formula 1 a seven-time world champion.