After getting a win against Liverpool, of course, the mentality of the Manchester United players improved drastically because after slumping in the first 2 matches they were actually able to win against a big Liverpool team.
and for the next game I think it is very possible Manchester United will get a positive result even though against Southampton it is not easy but for a team that has high confidence and also more quality players it is very possible for Manchester United to win this game.
Manchester united might have drawn motivation from their last match against Liverpool after a 2:1 win but the fact still remains Liverpool was the better team all through the match. Manchester hasn't built enough confidence for the season and secondly Southampton will be playing at home against United. If Hag must win this he needs to build a formidable defense and Midfield before the match