With Champions League teams chasing the Swedish forward, the Magpies are in danger of Isak asking to leave.
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On his future, Isak said last month: "I don't want to entertain these type of questions and rumours. It's not my position.
"I love playing, we have important games, there's no focus there (on my future), I just want to do good for the team."
Per Chronicle Live, a new contract with a higher salary would convince Isak to stay.