Estigarribia joins Juve on loan
The 24-year-old is Juve's eighth acquisition this summer. Estigarribia - who can play in left midfield or on the wing - played on loan at Newell's Old Boys last season and impressed at this summer's Copa America.
"I am really excited," said Estigarribia. "This is a dream come true. It is fantastic and also unexpected. I want to enjoy this moment.
"I am very proud to be here at Juventus. It is not every day that you get the chance to play for a big club and now it is up to me to prove that I belong here."
Juve will have the option to make Estigarribia's move permanent if they pay €5million at the end of the campaign.