Mercedes boss Toto Wolff says Formula One risks playing with fire if it does not take Ferrari's threat to quit the sport seriously.
Last year Ferrari was so unimpressed with the blueprint for the post-2021 engine regulations put forward by F1 it said it would leave the sport if the propsoal remained unchanged. In the time since, Ferrari president Sergio Marchionne has insisted he is serious, although FIA president Jean Todt last week said F1 should not stand in the way if his former team was serious about leaving.
Despite being rivals on the race track, Wolff says Mercedes and F1 would be worse off if Ferrari was not on the grid.