Michael McDonald, 19, who was from Beechmount in Riverstown, Tramore, Co Waterford died after falling ill in the Majorcan holiday resort of Santa Ponsa on August 4.
His remains were flown home yesterday.
A postmortem examination was due to be carried out last night by State pathologist Dr Marie Cassidy .
It had been initially suspected that Mr McDonald, known as Mikey to his friends, had died from meningitis.
Following his sudden death, his companions were examined by medical professionals at the popular Spanish resort of Santa Ponsa.
However, tests for the killer condition proved negative.
A postmortem examination by the Spanish authorities later maintained that Mr McDonald had died as a result of septicaemia, brought on by a burst liver abscess.
An only son, Mr McDonald lived with his mother Peggy in Tramore.
His page on the social networking website, Bebo, has been inundated with messages since his sudden death last week.
One from a friend who goes by the name, Dawn Flakes, read: “Just can’t believe it!! It doesn’t get any easier, it gets worse!! Miss u so much…it’s just not right without you here!!! Love ya!! Xxx”
Another, from Sarah Hewson, said: “Hey you, I miss you…!..love you xxxxxxxx”
“RIP Mike,” wrote Paul Walsh.
“RIP man, way too young to go,” according to a user known as Tin Tin.
Another friend, Mairead M, said: “When we made u laugh, u’d laugh at my stupidity.
“U were me n Dee’s brother; no matter wat, u were always der 4us.
“I cant do it without u mike...I want u back so much…
“I jus don’t want 2 believe ur really gone,” continued the tribute.
“It jus can not be…dis is not meant 2happen…u were always da person 2ring to see wat da plan wud be 4da nite.
“I wish we had more time wit u...I wud of done it so differently…
“I wud of told u I loved u and how I treasured ur friendship. U meant da world 2me.”
Mr McDonald’s remains will be removed tonight from Thompson’s funeral home on Barrack Street in the city and taken to The Holy Cross Church in Tramore.
It is understood that pupils from Tramore CBS, Mr McDonald’s school until last year, will form a guard of honour for him at the church.
Mr McDonald will be laid to rest at St Patrick’s Cemetery in Tramore tomorrow, following mass at the Holy Cross Church.