I see this as a clear opportunity for Erik ten Hag and his team to find the joy of victory again. Evidence Southampton still has no points with 3 losses so far. MU with a better quality squad is expected to easily win against Southampton. the current international break is enough time for strategist Erik Ten Hag to adjust to help MU stay on track. Not only that, MU will welcome the return of Luke Shaw and Rasmus Hojlund after injury. If I were a MU fan, I wouldn't forgive Erik ten Hag if they lost this match again. If it is true, Erik ten Hag should consider resigning as head coach soon.
I'm not going to bet on Manchester United they are going to win Southampton and that's because you see teams that are under performing and making less effort, they just look for an opportunity to unleash their improvements on their next match you least expect and you see the way Manchester United has been unstable with their results, Southampton might pull them over and teach them some lessons, the way there has been some underground talk in Manchester United camp, things doesn'took well for them.
I hope Erik Ten Hag stop the way he do substitute players on any mistakes they made. The last time he substitute Casemiro, it doesn't went well for him be he felt it's improper and a lot of people were all attacking him on social platform for repeating the same thing he did to Ronaldo some years ago. There were even post going around about Casemiro move to Saudi Arabia league. I don't know how true this information is, probably it's a coy for false information but Erik need to trade with caution, you don't pick enemy in every season.