haaland next club based on popular opinion are whether spain clubs ( barcelona/madrid) .. english clubs (manchesterunited/chelsea) .. or germany clubs indeed bayern munich.
but let's make that odd scenario!

Haaland should not be interested in playing longer in the Bundesliga even though Bayern Munchen are interested in hijacking him. Laliga and the Premier League are much better for a player like Haaland where he has the opportunity to show his capacity as a star player than any other league. He probably won't go to Barcelona considering their financial condition is very bad, so if he goes to Laliga then he will only go to Real Madrid in my opinion.
I do not know who will be bought by Newcastle this season especially in the transfer market this winter to overhaul their team. They should be able to bring some top players to the squad this season although it's not quite convincing at the moment for most people.