The Lancashire Evening Telegraph says Treacy has not returned to fight for a new deal at Burnley, after failing to hit his physical target.
The winger was not offered new terms by manager Sean Dyche at the end of his three-year Clarets deal.
But after playing his part in promotion Treacy was offered the opportunity to earn the chance to be part of their Premier League squad.
It is an incentive that the Republic of Ireland international appears to have passed up, with no sign of him on the squad's return to training this week.
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