Magpies head coach Eddie Howe said earlier this week the club are yet to receive a bid from any club for the striker.
“[Isak] is still our player. He’s contracted to us,” he added.
“We, to a degree, control what is next for him. I would love to believe all possibilities are still available to us. My wish is that he stays, but that’s not in my full control.
“We have not received a formal offer for Alex, from any club.”
Isak scored 27 goals in 42 appearances in all competitions for Newcastle last season.
Howe’s side lost their third match of pre-season on Wednesday with a 1-0 defeat by a K-League XI.
They face fellow Premier League outfit Tottenham at Seoul World Cup Stadium on Sunday.
