The former Chelmsford City, St Albans and Welling United player’s body was discovered this weekend.
Thalassitis shot to prominence on television show Love Island in 2017 but he also enjoyed a great playing career.
He also turned out for Boreham Wood, Hemel Hempstead, Concord Rangers and Hayes & Yeading. He was only 26 years old when his death was confirmed.
A well loved person on and off the field, the reality TV star’s former manager Rod Stringer says he is devastated by the news.
He tweeted: “It’s heart breaking and can’t speak highly enough of him lovely fella - and was a pleasure to have managed him. RIP”
St Albans City released a statement saying: “Devastating news. We are shocked and saddened to hear of the passing today of Michael Thalassitis.
“The team, fans and all those who worked with Michael during his time at the club have very fond memories and pass on their deepest sympathies to his family & friends.”
Ebbsfleet said: “All of us at Ebbsfleet United FC are shocked and saddened to hear of the death of our former striker Michael Thalassitis. RIP Michael – and our heartfelt condolences to all his family and friends.”
Hungerford Town manager Ian Herring wrote: “RIP Theo! Football world #ItsOkNotToBeOk ! It’s easy to say “talk” when it can be the hardest thing to do! Players... look around your dressing room, “are you ok mate?” won’t hurt anyone but might help someone!”
Another of his former managers Steve Brown tweeted: “I can’t tell you how smashing this fella was to be around, the dressing room was always buzzing when Thala and Ozzie got going.
“R.I.P Michael Thalassitis . My thoughts and prayers go out to his family in what must be an incredibly difficult time.”