The same thing also happened to several other top players. The accusations were not made immediately when the case occurred, but after some time they surfaced. Of course there is a motive behind it, otherwise the case will be handled as soon as possible when the incident occurs.
Now Manchester United is really in trouble. They lack key players, this is clearly detrimental to them. Antony will not be back soon and that has been confirmed by Ten Hag, but I hope this case is resolved quickly considering the league will start again. Without Antony, Manchester United will clearly have difficulties, it will affect their performance.
Ten Hag is a professional coach with a wide range of experience since time passed, and missing just one player from the team wont really have much impact on the performance of the other players in the team and from their next game, we will see that being proven.