Do not underestimate Juventus just because Pogba will not play for several weeks. They did not have any problem in his position last season because there are some players such as Zakaria Dennis, Locatelli, Arthur, McKennie who can play in Pogba's position. I do not think it is necessary for them to search for new player in this position, they can just use the available players while waiting for Pogba to be fully recovered from his injury.
Arthur will probably leave they are in advanced talks with Valencia.
Juventus according to rumors will go for Parades from PSG.
The deal about them is still not very lively at the moment although there are some who say it is just a matter of time but there is still no clarity on this.
On the other hand, actually Arthur is also a little difficult if he decides to stay and it would be better if he leaves even though this has to go back to Juventus as the decision maker.