Aaron Hickey on "five or six" occasions. The left-back spent time in the Parkhead youth academy, and has been linked with a return since breaking into Hearts first team.
And Levein says Celtic have made numerous attempts to bring the defender back, amid rumours of his exit this summer. He said on BBC Radio Scotland: "Celtic tried to buy him back half-a-dozen times and that just got knocked back."Celtic tried to buy him back while he was in the first team, I think it was five or six times." The youngster has plenty of suitors this summer, with revealing that Bologna are leading the race for his signature.
Sky Italia reports that he's already been shown around the Serie A club's training ground, with the awaiting a response from Hickey.
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