Right below Man United is Rangers who will be the opponent in the next match. On the one hand Man United gets a good chance to play at home and I believe Amorim is trying to give the players confidence to be able to win in the match to provide a bigger point difference. And after that Man United must play against FCSB and MU will play away which should be the worst result is just a draw. I think Man United is still in a safe position as long as they get 1 win and 1 draw to qualify for the next round even though it will be through the playoffs.
For Manchester United, the playoffs must be achieved in any case, otherwise it will mean a very bad job for Amorim as a coach. On the other hand, the results so far are not what was expected, Amorim was supposed to be the salvation for Manchester United, but after his appointment as coach, everything has become even worse than it was. In the Premier League, everything is bad, so he can try to achieve better results in the Europa League.