Manchester United does have a lot of midfielders, but only Bruno Fernandes is the only one who is consistent and his performance is quite good. Man United's midfield really needs some serious attention, they've had half a season already, but I think Man United's midfield performance is still far from good, so selling some players and signing some new players is not a bad idea.
You are right. Only Bruno Fernandes seems to play quite consistently until today, Man United must prioritize fixing the problem in their midfield line. Mata, Fred, McTominay, and Matic deserve to be put on the transfer list, these players are no longer showing their best performance. Selling these players can gain some money and make spots for new midfielders. They must plan to buy some midfielders, not only target to sign Gravenberch.
Manchester United finding a replacement as good as Paul Pogba with his incredible pass accuracy for their midfield won’t be an easy task, considering the level at which Manchester are at right now and how their past transferred players that was brought in has been so far, there isn’t really much to say about Manchester United recent signing apart from some player who are really trying their best to fit into the team, but as for me most good players wouldn’t want to play for Manchester United at the moment, they really look like a clueless team