Before the window even opened, United had committed funds to one of the most expensive arrivals in the club’s history, Brenden Aaronson.
Marsch was then reunited with more former players in Rasmus Kristensen and Tyler Adams as the American started the build a team for Premier League sucess.
Alongside Luis Sinisterra and Marc Roca, young prospects Sonny Perkins and Darko Gyabi were added to the roster - with potentially more players yet to arrive.
Thus far, the near-£100m spend has been covered by the big-money sales of Raphinha and Kalvin Phillips - but how does their net spend measure up to the other teams in the top flight?
Here we take a look at the expenditure-less-income of every Premier League team, ranked from biggest to smallest...
Alongside Luis Sinisterra and Marc Roca, young prospects Sonny Perkins and Darko Gyabi were added to the roster - with potentially more players yet to arrive.