The former Newcastle and Liverpool prospect left the Reds a year ago for Salzburg.
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ChronicleLive says Clark is now ready to leave Austria and favours a return home to England.
A loan-to-buy option has been mooted for the Geordie, who is open to returning to Newcastle for the new season.
Clark's permanent option would be valued at €5m and Sunderland are also interested in the son of Lee Clark, who played for both the Toon and the Black Cats during his career.