It means Ruben Amorim was backed with £216million to add five players to his first-team squad, though they recouped £68m from transfer deals of their own, and made roughly £90 million when you consider sell-on clauses and player bonuses as well.
Lammens will fight for a starting role at Old Trafford, but it might take a few weeks before he is trusted in goal amid fierce competition from both Andre Onana and Altay Bayindir.
Amorim has some tough decisions to make with matches against Man City and Chelsea after the international break, and here is what United's strongest line up looks like after the summer window.
United needed a new goalkeeper and Lammens has to be given the chance as their first-choice.
1. GK - Senne Lammens
United needed a new goalkeeper and Lammens has to be given the chance as their first-choice. | Manchester United via Getty Images
Yoro started the season well and deserves to keep his place in their back three.
2. CB - Leny Yoro
Yoro started the season well and deserves to keep his place in their back three. | Getty Images
De Ligt is the best option in central defence and one of the first names on the team sheet.
3. CB - Matthijs De Ligt
De Ligt is the best option in central defence and one of the first names on the team sheet. | Getty Images
Martinez has targeted a return to action this month and is still the best option on the left of a back three.
4. CB - Lisandro Martinez
Martinez has targeted a return to action this month and is still the best option on the left of a back three. | Manchester United via Getty Images