I wouldnt either. Ferrara wasnt a coach, as in litterally did nothing but write lineups, no coaching influence (remember how often our players had to talk to eachother mid game to know what to do), Del Neri's mark on our team is very clear, as he really coached it, even if to undesirable results/fashion. Basically meaning, an average coach is better then no coach, and Ferrara was basically the latter.
But under any circusmstances should we keep Del Neri. We MUST get a better coach, there are SEVERAL available that are better.