Unfortunately this can be difficult. We are entering that phase of the season where problems can arise at any time.
And one of them could be Dybala, who has an injury and it's not yet known if he'll be able to recover in time for the World Cup.
Dybala's injury was a big blow for Argentina. Because he was such a crucial member of the team. Messi and Di Maria also suffered injuries in the past few days, but they should recover before the world cup starts. From what I heard, Dybala is suffering from a rectus femoris injury. This is one of the most delicate muscles and should be handled with care. Dybala may undergo protein-rich plasma (PRP) injection to the area of lesion. Dybala himself has stated that he will be fully fit by the time world cup begins.