The forward, who turns 36 in October, has been out of the game since leaving Fleetwood Town at the end of last season and reports suggest he is training with Micky Mellon’s League Two side in a bid to earn a deal.
But Duffy, fondly remembered for his legendary goal at Hillsborough to help beat Sheffield Wednesday in 2017, is also planning for the future by taking his coaching badges, as well as investing in property.
Duffy recently underwent his UEFA A License course in Northern Ireland, after previously telling The Star of his desire to move into coaching when his playing career came to an end.
“I would like to stay in football… you never know where football can take you,” he said during his time at United.
“It’s something I definitely want to do because I love the game. I do think I have a good tactical mind and I understand the game. I would love nothing more than to pit my wits against someone who thinks they are more knowledgeable than me.”
Duffy was Chris Wilder’s first signing as Blades manager and made over 100 appearances in red and white, as United went from League One to the Premier League with two promotions in three seasons. But he was denied a fairy tale top-flight debut after a contract dispute saw him made available for transfer.