"I have received many text messages from Newcastle," he smiled.
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"They asked if everything was fine. They were just checking to see if I got out of the game all right.
"The way my season has been, it is understandable."
Isak: Newcastle in touch after Sweden 90
He has struggled with groin injuries this season, which is why he joked afterwards that Newcastle had been in touch after the 1-0 win.