Former Société Générale trader Jérome Kerviel is appealing to his former colleagues to help him avoid jail.
The 35-year-old plans to appeal to France’s highest court after losing his first attempt to overturn his three-year prison sentence for making huge bets that cost the bank 4.9 billion euros.
His initial appeal had been turned down earlier in the day.
Speaking on French television, Kerviel said witnesses had told him how their emails had been mysteriously deleted before the arrival of financial inspectors.
Kerviel has never denied masking the 50 billion euros in market positions that went wrong as the financial crisis unfolded in early 2008.
He has always said his bosses knew what he was doing, an accusation SocGen denies.