Karanka said: "I have said always that a player who wants to leave and Middlesbrough Football Club and another club agree the transfer...
"To find or to sell a player, to buy a player, to sign a player on loan, to bring in a player on loan from other places, all parties have to agree.
"If Stewart wants to leave and the clubs agree and everybody's happy, then yes, of course."
Karanka added: "If the club thinks that it's good for the club, good for the player and good for the club, I can't say anything."
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