Pogba chosen not to surgery, he will be out 5 weeks, it is a risky move but he want so save the mondial.
Juventus must don't hope too much for this guy, we already know how he is before because the injury is one of his achievements. so they don't have to be surprised if 5 weeks or more Pogba lies down in bed and missed the world cup. If I were Alegri, I have to plan to search for who a player can be filling up his position, If not, that is possible, we can see MU v.2 in Italy.
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.