Bruce tried to sign Long, 26, on transfer deadline day in the summer but saw the move fall through just before the close of the window.
"It's very difficult to comment on other people's players," said Bruce.
"All I can say is, if he became available, we'd definitely be interested.
"But things change in football clubs. A new manager might come in and he might be a Shane Long admirer - we'll have to wait."
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