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.
We will see the new Manchester United in the middle of the season or next season as we know according to recent rumors Manchester United already have a new owner which means finances are no longer a problem to bring in more players.