The Argentina international will link up again with former boss Erik ten Hag and could make his bow in the red shirt during one of our weekend friendlies, against Atletico Madrid and Rayo Vallecano, both live on the United App.
As part of his first visit to Carrington, the centre-back spent some time answering our club media questions for his opening interview as a Red.
See what he had to say in full...
Lisandro, welcome to Manchester United. How does it feel to be here?
“Thank you so much. Well, I’m really happy to be here, in this amazing club.