Conor Hourihane is in limbo as he comes off contract Aston Villa.
The Republic of Ireland midfielder spent last season on loan at Sheffield United but is now a free agent after Aston Villa did not renew his contract.
Wayne Rooney wanted Hourihane, 31, to join Derby and lead their League One promotion charge.
He had offered a three-year deal when Chris Kirchner was due to buy the club.
But Roo's decision to quit has stunned many current Derby players and targets, says The Sun, with Hourihane unsure of his next move.
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