Vlassis started his music career by creating a group named "PELOMA BOKIOU" ("ΠΕΛΟΜΑ ΜΠΟΚΙΟΥ") in the early 1970s.
In the early 1980s he costarred in the legendary theatrical play "Evita" starring Aliki Vougiouklaki (Αλίκη Βουγιουκλάκη) and him as Che.
Then he took up acting and starred in Greek movies, but his fame reached its peak in the 1990s when he started participating in popular TV series such as "Aparadektoi" (1991).
On the morning of Thursday, October 14, 2004, Vlassis, while making chamomile for himself and his wife, felt something in his throat.
They called an ambulance which arrived after half an hour, but it was too late for Vlassis.