Newly-promoted Sunderland are believed to be ready to open talks with the 22-year-old on Friday as the race for his signature hots up.
North End chairman Derek Shaw said: "Two clubs have been given permission to speak to David Nugent. It is now down to David Nugent to speak to them both. We respect the clubs´ request not to state who they are. At this moment in time, we will not be saying anymore."
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