I bet you Isak is not leaving Newcastle this summer. Some sources believe that Isak is pushing for leaving the club out to pressure Newcastle for increased wages. Because the previous owners promised him a new contract in January but they've left
Now the new owner believes giving Isak what he wants is risky due to PSR but Isak refused to agree with that. He believed they went back on their words and the way the club is operating it's said him and few players aren't happy about it
This could be the case because he still has three years of his contract with Newcastle United but recent Liverpool interest make things problematic for Newcastle United, and he started acting like this many players now think about money so maybe his tactics works and Newcastle United increased his wages.
Liverpool already signed Hugo Ekitiké which is also good signing for them but still their interest in Alexander Isak is creating conflict between Isak and Newcastle United but most chances this could be settled or maybe next season he could be able to have transfer. Newcastle United can afford increase in wages because now they are having good chance of doing good in Champions League and their squad depth is also good which can help them for having stay into top ranks for next season.