A very interesting match, both need 3 points to maintain their position. It seems unlikely that it will happen if Nottingham deliberately let Manchester United win in order to stay in the Champions League. Nottingham will not easily give up for Manchester United to be in the safe zone. The obstacle for Nottingham is if Chris Wood is absent in this important match, then they will experience defeat even though Manchester United's performance is declining. Nottingham is not an equal opponent in the next match.
Maybe you mean the Premier League is not the Champions League because both teams are not in the Champions League competition this season. And what we need to believe in this case is that each team will always try to secure three points after the match is over because there is no story of intentionally or letting the opponent win as long as the team has the ability to prevent it. The Nottingham Forest vs Manchester United match could be quite exciting because Manchester United is usually more enthusiastic when facing a team that is already at the top.