The former England international has been linked with a £2.5million move to Premier League side Stoke.
Blackwell told the Sheffield Star: “I can confirm that Stoke have made an enquiry.
“I have left it with my board of directors and it is up to them to decide what to do from here.
“As far as I’m concerned James is still a United player and that is how it will stay until I’m told otherwise.”
