Career
Petratos is from Greek ancestry. Sydney Football Club Petratos made his debut as a substitute for Sydney Football Club in their Round 13, 1-0 victory over Newcastle Jets at the Sydney Football Stadium during the 2010-2011 season. He played continually since his debut off the bench and was in the starting 11 in some games.
He scored his first senior A-League goal against Gold Coast United on 8 January 2011 which set Sydney on their way to a 2-0 victory.
Sydney Football Club secured him to a new two-year professional contract on 13 January 2011, replacing his youth league contract. Following a reported bust-up with Zeljko Kalac, Petratos requested for and was granted a release from Sydney Football Club, allowing him to pursue a move to Malaysian Super League Champions Kelantan.
Kelantan On 7 December 2012, Petratos made a goalscoring debut for Malaysian side Kelantan in a pre-season friendly against Perlis which ended 5-0. Petratos immediately had a very strong connection and passion with the fans and supporters and in the month of December 2012 continued his goal scoring form, scoring 4 goals in 4 games He then scored another 2 goals against Penang FA on 24 December to take his tally to 6 goals in 5 friendly games.
Foreign player restrictions in the Malaysian Super League meant Petratos played exclusively in the 2013 AFC Cup, where Kelantan were drawn in Group G along with Maziya South&Remote Control, Ayeyawady United and SHB Da Nang.
He featured in all 7 matches for Kelantan in the competition, scoring 4 goals as they were knocked out by Kitchee South Carolina at the quarter-final stage. Brisbane Roar In June 2013, Petratos was signed by the Roar on a one-year deal, along with former Melbourne Victory defensive midfielder Diogo Ferreira. On 26 December 2013, Petratos scored his first career hattrick against his former club Sydney Football Club. On the 17th of July Petratos scored the opening goal against EPL giants Liverpool.