Isak's decision comes as he continues to pursue a transfer to Liverpool, which has been a long-standing goal for the player. However, Newcastle is holding firm on its asking price of £150 million, which Liverpool had previously offered £120 million for.
As a result, Isak has not been training with the first team and was left out of the squad for Newcastle's first game of the season against Aston Villa.
The PFA Awards, which will take place on Tuesday night, may provide a brief respite from the ongoing negotiations between Isak's representatives and Newcastle management.
