Isak saw an approach from Liverpool turned down by Newcastle last week. The Swede was sent home on Saturday from Glasgow rather than feature in the preseason friendly defeat to Celtic.
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Toon manager Eddie Howe said it was his decision, believing Isak had been unsettled by Liverpool's attempt.
Meanwhile, Isak's agent Gonzalo Gaitan told Saudi newspaper Arriyadiyah: "We are indeed studying and analysing all options, and we may be close to finalising the next step for the player.
"Without revealing any details regarding whether Isak will transfer or stay with Newcastle."