The French World Cup winner will join the Reds following his move from Real Madrid and adds to manager Ole Gunnar Solskjaer defensive options heading into the season.
Varane will take the same shirt number as the one he first had with Real after his move from Lens back in 2011.
The four-time Champions League winner also had two other numbers whilst with the Spanish giants, the no.2 and the no.5.
The last occupier of the no. 19 at United was Ivory Coast forward Amad but the Ivorian will now wear 16.
We've also had new numbers for goalkeeper Tom Heaton who will wear the no.