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Pre-season games usually don't have any motivation for the top clubs to win the game. Yes, I agree that in this match both teams gave one hundred percent of their abilities. But this is not the first time a top team from the English league has lost to a mediocre team. I think Manchester United really made this a game to test a lot of different tactics. Rosenborg scored a goal late in the game so I think both teams played very well. But a defeat is still a defeat and Ten Hag also said that this was not the performance United should have.
Manchester United should be able to win the battle against Rosenborg, it's just that in this pre-season match, clubs usually only warm up their players before actually playing a full season of competition. Apart from that, there are several scenarios that coaches carry out to measure their players apart from experimenting with the systems, tactics and strategies that they implement. So, losing this match does not have a big impact on Manchester United. Moreover, several of the players that Ten Hag included in his starting line-up were United's young players.
Unfortunately, because United's performance was not better in the previous season, the defeat against Rosenborg in this pre-season match was something that further worsened Ten Hag's image. However, at least we know that if Ten Hag played his full core of players, Rosenborg would not be a balanced opponent for the Red Devil. Apart from that, if I check the players that Ten Hag played in the second half, they were all young players. It would be very natural if in the end Manchester United lost, after all the goal was scored in the last minutes of this match. Let's just monitor it, throughout the pre-season matches that United plays.