The 31-year-old was involved in some social media interaction with Celtic fans over the weekend after his Sheffield Wednesday deal expired.
Hooper was one of Lennon’s key signings in 2010 as he put a new side together from the transfer fee raised by the sale of Aiden McGeady to Spartak Moscow.
Celtic paid Scunthorpe £2.2m for the striker and doubled that fee when he was sold three years later after netting 82 goals.
The Sun reports
Interim boss Lennon is still waiting to hear from major shareholder Dermot Desmond and chief executive Peter Lawwell whether he’ll be replacing Brendan Rodgers long-term.
But over the last month he’s still been working hard identifying potential signings, with Celtic – and whoever’s in the hotseat ?– facing a huge rebuilding job in the summer.
Between out of contract players and loanees returning to their parent clubs, there could be a need for up to 10 new arrivals.
Former Tottenham academy kid Hooper is precisely the kind of poacher Lennon believes the eight-in-a-row champs need to bolster their attack.
Lennon’s also well aware of a need to significantly strengthen defensively in the full-back and centre-half positions, while he’d also seek to add midfield and wing quality.
Celtic’s striking options at the moment seem to start and end with Odsonne Edouard.
Leigh Griffiths and Bayo have contributed around give minutes of action to the team in 2019 with question marks over what sort of impact they will make next season.
The prospects of a move for Hooper’s would depend largely on his fitness following a season that consisted of just six appearances and one goal for Sheffield Wednesday.
It’s believed that there has been interest from American clubs in Hooper.
Dignity loses out to anger and ragehttps://t.co/L5OjQLPIil
— Joe McHugh (@videocelts) May 7, 2019