The news was confirmed by his manager at the weekend, however the cause of his death has not yet been released.
He was also struggling to come to terms with the death of one of his best friends, Danny Cutts, who suddenly died in December.
Some reports have surfaced that the ex-footballer was having a hard time dealing with the death of his grandmother, who passed away a few months ago. Mike you are going to be sorely sorely missed.
Mike had recently moved in with his 94-year-old grandmother as her full-time carer.
He had enjoyed a successful sporting career before appearing on the reality show in 2017 and also had spells at Ebbsfleet and Welling.
He found fame on the 2017 series of the ITV show.
Following his success on reality TV, Mike went on to star in Celebs Go Dating a year ago.
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Our thoughts go out to Thalassitis' family and loved ones during this hard time.
Thalassitis, commonly known as "Muggy Mike", hosted a night at Fever and Boutique in Exeter past year. I won't forget that... it's so so sad... you will be missed. All the articles how dare you not use his real name. "My heart breaks for your family RIP MikeThalassitis".
"I am absolutely in shock of the news". Please stop brandishing that.
She added: "My heart and soul and love goes out to his friends & family".
Fans of the show took to Twitter to scrutinise show producers over their aftercare for contestants, following the death of Sophie Gradon previous year. "A good guy, taken far, far to soon", Chris Hughes, who also appeared on Love Island, wrote.
"I'm shocked and extremely saddened to hear reports of the passing of [Mike Thalassitis]. Way too young. Thoughts and prayers with his friends and family".