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.
Before he joined, surely Allegri had considered this player. Luckily they still have Di Maria ready to take his place. With that, Allegri means that he has prepared the players if something happens to Paul Pogba like now.
It may be true that Pogba is prone to injury, but things like this are not easy to control because they just happen.