As a result, Red Devils fans are already eager to get their hands on their own personal "Alexis 7" jersey. The kit is sure to be a huge seller on United's official webstore with many supporters looking to give their new signing a warm welcome to his new club.
Goal investigates exactly how much will a Man Utd shirt with Alexis Sanchez on the back cost?
How much does Alexis's Manchester United shirt cost?
A full-price Manchester United adults' home jersey costs £60 on their online store, but is reduced to £35 as part of their ongoing sale. A kids' shirt is £50 but is not currently on sale.
The official store also offer player numbering options for any senior squad member, while customers can also select to input their own names and numbers if they wish to personalise a jersey. This allows the user to create a jersey with unsigned players or past legends if they wish.
The price to add names and numbers is set at £12.95, while it costs an extra £6 to add the Premier League branding on the sleeve.
In total, Alexis Sanchez's number seven jersey at Manchester United costs £47.95 or £53.95 with the Premier League branding.
It is slightly more expensive in Euro, costing €39 after being reduced from €80, with an extra €15 for numbering and €6.79 to add the Premier League logo.
Currently, the Manchester United adults' away jersey is not reduced, and costs £60 before any extras like names and numbers are added. Both the kids' and womens' jerseys are currently reduced.
The third kit is the same price as the home jersey during the sale, while the kids' shirt is reduced. Numbering costs the same on all kits regardless of size or gender.
In comparison, Alexis's personalised jersey at Arsenal cost £71 for an adults' home jersey while an authentic jersey cost £116 - so Manchester United supporters will get a great bargain when the 29-year-old lines out at Old Trafford.