"Anything is possible, of course, especially if we look at the last few races," the 47-year-old told Sky Germany. "Who knows, Magnussen may not be so firmly in the seat anymore? If we look at the races since Silverstone, we have to conclude that Mick is the more stable and better of the two drivers.
"He has also had some bad luck with wrong strategies. In the last race [the Mexican Grand Prix ], Mick was sometimes up to six-tenths faster than Magnussen – so let's wait and see for the next few races. I hope Haas make a decision soon. Maybe next year we will have two Germans on the Formula 1 grid."