What is Ten Hag doing for the team right now? In my opinion, buy an excellent striker like Victor Osimhen. That should solve any problems they're having. Ten Hag does not need to try to create a solid defense. When the attack is having difficulty in scoring.
Focus on scoring instead of investing in defense. Attack the opponent's goal instead of firmly entrenched. Of course, it's great that the positions in the team are equally strong.
Manchester United have signed Rasmus Højlund this season so that's enough for a while besides that they have limited funds, you may forget that defense is one of the most important lines even if a team has 2 players like Messi and 2 Ronaldo or 2 Benzema it is useless without defenders

And here Ten Hag knew they needed a defender to cover player injuries, if you pay attention in the last 2 matches Manchester United have conceded 4 goals meaning there is something lacking/weak in the defense area so looking for a new defender is the right idea.
Well that's right, it makes perfect sense to digest. Basically, all sides of the pitch need to work well together and that helps the balance of a team on the pitch. They have good strikers but it will be useless if there are no defenders who can be relied upon to guard the backline, and vice versa. And it might be a disaster if the opposition find out about their weaknesses. Of course, looking at their last two games may be enough to signal that they need improvement in defense, it is very clear that they will not want something that is not wanted to happen again in the next few matches. Looking for a new defender might be the right idea but I'm not too sure about that because they still have Victor Lindelof and maybe they'll use him for a while.