He made his Argentina debut aged 20 against Japan in 2005,[4] playing as a flanker, two years later he signed his first professional contract with French Top 14 side Biarritz[5] in 2007.

After cementing his status as Argentina's number 2 hooker throughout 2010, Creevy was signed by Clermont[2][5] as a medical joker for the injured Willie Wepener in October 2010 on recommendation from Mario Ledesma.

[5] In August 2020, he signed a one-year contract with Premiership Rugby side London Irish,[6] ahead of the 2020–21 season.

[7][8] In February 2021, Creevy spoke of the idea of renovating his contract with London Irish, staying in England, and playing in the 2023 World Cup.

[9] In the same month, he extended his contract with the club and was joined by compatriot Facundo Gigena, who arrived from Leicester Tigers.

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.

Creevy is known as a mobile hooker with some very good ball handling skills for a hooker, his good offloading skills have led him to become called "Sonny Bill" Creevy (after the All Blacks centre Sonny Bill Williams whose trademark is offloading) by some Montpellier fans.