I have hopes for Man United in this match and I think the match will end in favor of the visitors. Even though they experienced instability and in the Premier League, Nottingham Forest managed to beat Man United, this does not mean that in the FA competition they will allow them to lose again. Only this championship has a chance for Man United and I am sure Erik Ten Hak will try everything to get victory. The previous defeat when playing at Old Trafford was very surprising because Man Unied was in a positive trend.
Nottingham Forest is also not very consistent and even though the match will take place at their home ground the chances are still the same. If Man United does not try to chase champions in this competition, then this season Man United could lose all the opportunities that exist because chasing other competitions will no longer be possible for Man United.
FA Cup become the only one opportunity left for Manchester United winning the trophy after gap many points in Premier League and I don't sure Erik ten Hag have enough compete to make miracle for domestic league winner. In Fa Cup 5th round, Manchester United has away match for facing Nottingham Forest, Erik ten Hag have to forget last match losses against Fulham and keep trying to win the left opportunity for getting trophy in this season.
Nottingham Forest performance still not consistent yet after losing last match in Premier League against Aston Villa and other side their position standings in domestic league left fewest points with relegation zone and likely FA Cup match against Manchester United will use their second players composition.
I would say Nottingham Forest are not a strong team. It is a relatively weak opponent. Nottingham Forest's position in the Premier League points table is 17th. The team is very close to the relegation zone. So it can be said that Nottingham Forest is far behind Manchester United.
Nottingham Forest's performance against Bristol City in the previous FA Cup match was not good either. They were very lucky to qualify for the fifth round. Nottingham Forest drew both matches against Bristol.
However, while Nottingham Forest's players have failed to play consistently well, the team has occasionally produced excellent performances. A few days ago we saw Nottingham Forest win 2-0 against West Ham. Moreover, Nottingham won 2-1 in the previous match against Manchester United. So if Manchester United wants to win, they must perform very carefully.