Sources claim the reality star was found dead in Essex yesterday.
Thalassitis competed on the third season of the British reality show back in 2017, where he became known as "Muggy Mike". A year later, he went on to feature in the United Kingdom series Celebs Go Dating.
He split from his TOWIE star girlfriend Megan McKenna, 26, last year.
"All at the club wish to express our deepest sympathies to all the family and friends of Michael, which include many of our past and current playing and management staff".
Chris Hughes, who also appeared on Love Island was among those who paid tribute. Please stop brandishing that.
"His name was Mike Thalassitis, and every inch of my heart goes out to his family and friends. A good guy, taken far, far to soon". "Too much pressure and not enough support for these young people who are probably not prepared for the sudden fame etc". "Devastated to hear of the passing of Mike Thalassitis", the journalist told his 340,000 Twitter followers.
"In absolute shock. Mike Thalassitis your lovely self and smile will be truly missed".
"Mike wasn't the lad you saw on Love Island".
Mike Thalassitis RIP
"Mike you are going to be sorely sorely missed".
There had been speculation that the pair were at one time romantically linked.
Prior to competing on Love Island in 2017, Thalassitis was a semi-professional soccer player in England, according to The Guardian.
In a post to Instagram, Mitchell said he was "heartbroken" by news of Thalassitis' death, hailing his "positivity and charisma".
"I can't believe the call I've just had".
One fan wrote on Twitter: "Just goes to show people can only take so much no matter how big their following".
Tyla Carr, who had a short romance with Mike during the ITV2 dating show, also remembered her friend on social media.
Another added: "Love island is cancelled this year". You were the kindest soul, you were so amusing and you had so much to live for.
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