The 27-year-old, who started out as a flanker before switching positions, will now make the move across the English Channel his summer to join Richard Hill's men.
And Sixways will need no introduction to Creevy who has already enjoyed success at the stadium having captained Argentina to victory when they played Warriors in a friendly on the eve of the Rugby World Cup in 2011.
He said: "The chance to play in England is something that was always my intention, in fact I have previously had two opportunities, but the time was not right.
"I have recently had many offers from clubs in France and England, but decided the time was now right to experience the culture and play in the Aviva Premiership.
"I spoke with several clubs but, after my conversation with Richard Hill, I decided Worcester was the club. I was very aware of the magnificent facilities in Worcester as I captained Argentina at Worcester in a pre-World Cup friendly and all the squad was impressed with the stadium and also the very good support from its fans.
"I have greatly enjoyed my time in France playing with very successful clubs at Biarritz and Montpellier and during this time in the Top 14 have played many English teams in European competitions and have always been impressed with the standards of clubs and play.
"I am delighted to now come to England with a new wife, excited in exploring a new culture and playing in the Premiership as a Worcester Warrior."
Creevy made his Argentina debut aged 20 against Japan in Buenos Aires in 2005, playing as a flanker, and two years later signed his first professional contract with French Top 14 side Biarritz.
Argentina coach Santiago Phelan suggested he switched position from flanker to hooker in 2009 and he was granted an early release from his contract with Biarritz to return to Argentina to adapt to playing his new position.
Creevy was selected to play for the Argentina Jaguars in Namibia just a few months later in May 2009 and was retained for the 2009 Churchill Cup. He was then selected for the senior Argentina side for the 2009 November tests and replaced Alberto Vernet Basualdo as the Pumas understudy to Mario Ledesma, all in less than a year of playing hooker.
He was signed by Clermont as a medical joker for the injured Willie Wepener in October 2010 on recommendation from Ledesma. He returned to the Pampas XV in 2011 before he was signed by his third Top 14 side in Montpellier.
Creevy is known as a mobile and skillful hooker and was nicknamed "Sonny Bill" Creevy by Montpellier fans - after All Blacks centre Sonny Bill Williams - because of his offloading ability.