They got 120 million € for Pogba and spent 94 million € to Higuain already. They don't have much left to buy Mascherano, considering he's one of the best centre backs right now. I don't think Barcelona would sell him, especially for a cheap price.
Do you think juventus only have the money from selling pogba? they won the serie A and the itallian cup , they got some cash for them and they could be using it if they want to, dont underestimate them but they are currently #1 club in serie A , they got a lot of cash flowing around from sponsors as well
Juventus have potential. He can sell Simone Zaza, Ernanes, Mario Lemina, Roberto Pereira players who are not in the foreground but worth ~50-60 million.
Without Pogba transfer, Juventus can earn lot of money.