Canaries boss Chris Hughton has made no secret of his desire to add more depth to his attacking options this month, with the club also chasing Leeds forward Luciano Becchio.
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"I think Norwich came in with a third bid yesterday and it was rejected," Lennon said.
"They were well short. We don't have a price on Gary, but the bid that was put in yesterday was well short.
"All I can say is if a deal can be done, we may get offered players and people may ring up about our players - that's the way transfer deadline day works."
Hooper has just 18 months left to run on his current deal at Parkhead and has been offered a new extended contract, but the player remains reluctant to commit himself to the club long-term.