Amorim will have quite a lot of work in the MU team to bring them through to the next round of the Europa League. Although the chance to qualify is still open, I see competing with other teams will be quite difficult for MU even after qualifying.
Man United actually still has a chance to finish the league phase in the top 8. If Man United can win in the next 3 matches, the chance is still quite open. In the next 3 matches, Man United has quite easy opponents. So, I think it won't be so hard for Amorim to lead Man United to the next round. However, surely they need a little luck to qualify automatically.