Mathematically there is no possibility for Manchester United in the Premier League this season, they are already very far behind and maybe trying to avoid the relegation zone is a realistic thing for them.
This weekend Manchester United will visit Nothingham's headquarters this weekend, it is really a very difficult job because Nothingham's performance is very impressive this season so I think there is no need to expect more for the results of the match, maybe getting 1 point is very good for Manchester United.
And for the focus of Amorim's team, of course, they will focus very much on the Europa League competition because only in that competition they have a good possibility and also there is great hope to be able to get a ticket to the Champion League next season by winning the Europa League title this season, so of course that will be their main target now that is possible to achieve.
Is obvious that not'for is in a very good performance this season, while manchester united in the other side is not that good. this is why the possibility for not'for to win manchester united is very high than that of manchester united, Just like as I said earlier that manchester united is unpredictable sometimes. you will be surprise that manchester united will end up gaining victory over not'for in this match without even minding if their wining possiblity is low or not, of course I have seen this happening countless time. So we can't possibly predict the outcome for now.
I don't think Man United will go all in against Nottingham Forest because after that they have to play against Man City and then they have to play in the Europa League against Lyon. I think the European League will be their main attention, so there is a possibility that Man United will slack off a little in the Premier League matches to keep their stamina fit and minimize the potential for injury. So it would not be surprising if Manchester United lost against Nottingham Forest, besides Forest is also in good form (plus play at home), so they will definitely be aiming for a win to secure a top 4 position.