Lennon wants a Champions League standard striker in place ahead of the qualifying rounds in mid-July.
Asked to name his summer priority, the Parkhead boss responded: "Centre- forward. Everyone is looking for one of them.
"I'd imagine the Hooper thing would rumble on but whether we could tempt him back or not I don't know.
"I don't like talking about a player who's under contract at another club. But we think very highly of Gary put it that way.
"Whether we could do a deal he or the club would entertain, I don't know.
"It would be nice to have him back but I think we'll be a long way off that I'd imagine."
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