Ferrari say they could consider their future in Formula 1 if the rules change in ways they do not like.

President Sergio Marchionne said quitting was "possible but very, very unlikely", adding: "Ferrari would find other ways to express its ability to race and to win.

"Ferrari cannot be put in a corner on its knees and say nothing."

The warning comes as F1 boss Bernie Ecclestone is pushing for the sport to switch to cheaper, simpler engines.