Bayern Munich are really after de Ligt currently but for now it seems like just an interest. I haven't heard of an official offer yet. Chelsea are in this race also and I see Bayern Munich one step ahead of them. But the opinion of the player is the most important point here of course. de Ligt can be an important part of the team if he stays at Juventus. Because Chiellini has left the team. If he doesn't desire a move out of Italy then Bayern Munich and Chelsea both might be unsuccessful about signing him. Unless they pay the release clause amount of course. 
Bayern Munich has sent some representatives to Italy to making a bid for de Ligt. Certain that everything will be positive at the end of the day.The player wants too make the move and the club's are in a good agreement and no disagreement between them. Then, the deal is good to come to conclusion. Bayern building another strong squad with young talent's.
Right now, pointing out all this just rumors because nothing is sure but in next few days things could be clear, and we will have all better updates about this interest because with current situation no club is interested in this player Barcelona needs to change contracts few points for having to settle this all.