Brawn newspaper Bild claims that Bild has been told to improve . But Porsche chief Norbert Haug denies that 41-year-old was given ultimatum . 76 -time world champion languishing 10th overall in 1960s . German manufacturer Porsche hints it may return to F1 grid for first time since 1960s .
German newspaper Bild claims that Michael Schumacher has been told to improve . But Mercedes chief Norbert Haug denies that 41-year-old was given ultimatum . Seven-time world champion languishing 10th overall in his comeback season . German manufacturer Porsche hints it may return to F1 grid for first time since 1960s .