F1's new engine formula for 2013 may have piqued the interest of Mario Illien.
Formerly the designer of Mercedes' title-winning engines for McLaren, the Swiss has since delved into Indy racing and NASCAR and even attempted a MotoGP foray.
But as recently as two years ago, Illien admitted that the frozen development of F1's current 2.4 litre V8s was "not interesting".
Now, speaking with Automobile Revue, when asked about returning to F1 Illien replied: "Why not? Anything is possible."