Giorgios Karagounis thinks Damien Duff could one day return to Celtic as manager.
The Irishman spent a year and a half at the Parkhead club between 2019 and 2020, starting as an assistant with the B side before taking on a similar role with the first team.
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Karagounis played with Duff at Fulham, and reckons he may one day move back to Glasgow's east end and lead Celtic from the dugout: "Why not," said the Greek [Spin Genie].
"As a teammate, Damien Duff was special. He was very professional at Fulham, and he helped me a lot. He always gave everything 100%.
"He was a great team-mate and a very good friend, I think he will have a very good career as a coach. He has a winning mentality and I wish him well, he is an extraordinary guy."
Duff is currently in charge of Irish top-flight side Shelbourne.
He was appointed boss at Tolka Park in November 2021 and has held his post since.
Duff won the league with his team last year, and they currently sit fourth in the table, just two points behind leaders Drogheda United, 11 games into the 2025 campaign.
Elsewhere, former Celtic manager Neil Lennon thinks the club can break the 'glass ceiling' and go beyond the last 16 of the Champions League.
Lennon also reckons a wealth of groundwork is currently ongoing at the club regarding summer transfers.
He said [Scottish Football Social Club]: "The last 16 has been the glass ceiling since my time, since Gordon Strachan. I think it can be broken, and they've got the financial power to do that. They've also got the manager to do that.
"There will be discussions going on from now until the transfers are made.
"Maybe one player leaves. Two good ones left this season in Kyogo and Matt O'Riley, but they were still very, very good in Europe and great domestically.
"What Brendan will want is to improve that incrementally. Yeah, it's going to cost money, but the money is there to be spent."