I don't think any star player is interested in joining the Newcastle team now. Star players will definitely want more wages, at the same time, they will definitely want to play with the same good squad and will want to win the title. Newcastle will probably provide many wages. But they can't afford to fight for the Premier League title. And I don’t think it will happen next season either. They have to slowly sort out the team.
Well you are quite right, it won't be an overnight process rather will take sometimes. Star players have other requirements also apart from attractive pay cheques. Many compares this take over with Man City take over by UAE prince, that helped City grabbing the first English premier league title in 2020-21. It seems like new management is straight on the business...
Fresh reports have surfaced indicating that Newcastle United are hoping to acquire the City Football Group's Managing Director of Global Football, Brian Marwood. Source