As a result, he is now in demand, with Liverpool and Al-Hilal showing interest in signing him.
Newcastle is keen to keep Isak and tie him down to a long-term contract, especially as they prepare for Champions League football next season.
According to reports, Isak is now asking for a significant wage increase, reportedly £300,000 a week, to sign a new contract with the club.
Isak's current deal at Newcastle runs until the summer of 2028, giving the club a strong position if they decide to sell him.