Rafa Benitez says he's had "private" conversations with a number of players over their futures at Newcastle United.
Benitez is looking to move a number of players out of the club before the summer transfer window closes.
Asked if Colback – who has retained, for the moment, his No 4 squad number – had been told he was free to leave the club, United manager Benitez said: "I talk with my players individually, privately, and I am telling them what I think, my opinion, and after it depends on each one.
"But at the moment he's a player of the squad."
Newcastle must confirm their 25-man squad once the transfer window closes at the end of the month.
Tim Krul, Achraf Lazaar and Emmanuel Riviere will be left out of United's Premier League squad.
The trio – who have not been given squad numbers for the new season – have been training at the club's Academy for the past month.
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