|Date of birth||28 January 1986|
|Place of birth||Gera, Greece|
|Height||188 cm (6 ft 2 in)|
|2004–2005||→ Keratsini (loan)||27||(5)|
|2005–2006||→ Haidari (loan)||25||(4)|
|2008||→ OFI Crete (loan)||10||(4)|
* Senior club appearances and goals counted for the domestic league only and correct as of 17 October 2015.
Petropoulos was born on 28 January 1986 in Athens, Greece. He scored 4 goals in total, 3 of them in his last two games with Egaleo. He scored his first goal against Kerkyra FC in 2006, and 2 goals against Ethnikos Asteras in 2008.
On January 2008, Petropoulos joined Panathinaikos FC signing a contract with a minimum release fee clause of €6,000,000 and a year later has signed a new 3-year contract with the club. Petropoulos is believed to have signed a deal that could see his annual wage rise from €45,000 to €150,000. The striker spoke of his pleasure at having re-signed with the club following the completion of the deal. “I am extremely happy to stay at Panathinaikos,” Petropoulos said. “I want to play at this club for many more years. I want to thank my coach, Henk Ten Cate and the management; I will fight to justify the confidence they have shown in me.” He scored 7 times in the 08/09 season, however he remained in the bench for the whole of 09/10 season as Djibril Cissé was the main offence choice. Due to a Cisse injury, he started the premiere of the Greek Superleague 2010–2011 against Xanthi, where he scored the only goal for Panathinaikos in a match that ended 1–1. On 19 December 2012 he played and scored against Proodeftiki F.C. in the Greek cup for his last time with Panathinaikos.
After the mayhem of transfer deadline day, a reminder – perhaps – that the best things in life are free. Unable to get regular football in five years at Panathinaikos, Petropoulos was released and immediately signed by stricken giants AEK Athens, bottom of Greece Super League with three wins in 15 top-flight matches. Petropoulos became the 19th player who transferred from Panathinaikos F.C. to rivals AEK F.C..
However, since his debut in the 3-1 loss at Asteras Tripolis in early January, he has scored in each of AEK's next three games, with the resulting seven points lifting his side – never relegated – to 12th in the 16-team competition. More specifically, he scored his first goal in a Superleague Greece match against Skoda Xanthi F.C.. He scored another goal against Aris F.C. on 20 January with a great header after a cross by Michalis Pavlis He scored for third match in a row against OFI. "I don't even want to utter the word 'relegation' – we are talking about AEK and I cannot imagine a league without AEK," said Petropoulos, who celebrated his 27th birthday on Monday. "I feel better now going onto the pitch because I am playing for a club who believe in me. I have nothing to prove. I know who I am and I always do my best."
On 18 August 2013, Petropoulos made his debut with his new team and scored one goal in a 2-1 home victory against Aris. Besides the fact that Apollon Smyrni did not avoid relegation, Petropoulos has the best year in his career by scoring 12 goals. As a result of his exceptional year, Metz, Chievo and Hellas Verona are interested in him.
Second spell on OFI Crete
In the summer of 2014 due to Apollon Smyrni's relegation to second division Petropoulos signed for OFI Crete. He scored a 91st-minute winner on his debut. Petropoulos left OFI half a year later due to serious financial problems at the club. 
Petropoulos passes for the first time in his career, the Greek borders in order to pursue his career in Italian club Bari 1908 playing for Serie B. The Greek winger passed the medical examinations, signing a two years' contract with the club for an undisclosed fee.    On 17 October 2015, in the 8th day of 2015-16 Serie B season he made his debut as a substitute in an away 3-0 loss from Ternana Calcio.
1Includes Greek Superleague playoffs.
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