Dybala wasn't sold. His contract expires at the end of the season and after that he becomes a free agent. He is free to go wherever he wants. The contract couldn't have been extended because Dybala requested too high of a salary. Someone might say that the club could have given him the wages he requested and then sell him. But that creates other problems. He isn't playing at his best and it would be difficult to find a club willing to offer him the same (or better) financial terms. And Juventus would be stuck paying too high wages. Something similar is happening with Alex Sandro, for example. The guy is basically retarded, but not even weaker clubs want him because he earns too much.

There are no more Play-off rounds for those finishing 4th in the Italian Serie A. All 4 clubs are automatically qualified for the Champions League. The rules were the same last season as well.