Erik ten Hag could play Eriksen simultaneously with Bruno Fernandes although both have similarities in key positions as attacking midfielders in the team and install Scott McTominay under them or in the defensive midfielder whose role is often played by Nemanja Matic.
If they add Eriksen and Fernandes both to the lineup at the same time it would be a big advantage for Manchester United. Their priority is defense of course but it looks like they have started to fix things there also. Lisandro Martinez deal is done finally as it seems. They won't need to have Maguire in the lineup from now on which is very good. He was really horrible last season. Now they are trying to finish the Frenkie de Jong deal also to have a solid defense line.