|Date of birth||10 February 1991|
|Place of birth||Athens, Greece|
|Height||1.90 m (6 ft 3 in)|
|Playing position||Center back / Defensive midfielder|
|* Senior club appearances and goals counted for the domestic league only and correct as of 19 March 2017.
‡ National team caps and goals correct as of 19 August 2013 (UTC)
Κoutroubis started his professional career in Football League playing for Kallithea F.C. On 9 August 2012, with a personal interference from ex AEK Athens president and major shareholder Dimitris Melissanidis, signed a four years' contract with AEK Athens for an undisclosed fee. After AEK's relegation, Koutroubis due to his club financial problems, asked for his contract to be solved, trying to sign with rivals Panathinaikos.
Koutroubis could not be officially announced by Panathinaikos, because he still had a contract with AEK Athens. On June 26, 2013, he participated in Panathinaikos first training session for the 2013-14 season. On July 2, 2013, he filed an appeal against AEK Athens, in order to get whatever the team owed to him. On the same day, he travelled to the Netherlands and Osterberg, in order to take part in Panathinaikos' summer preparation. On 17 July 2013, it was officially announced that Koutroubis had signed a four-years contract with Panathinaikos.
In summer 2016, Adanaspor are monitoring the case of Panathinaikos' 25-year-old central defender Giorgos Koutroubis, whose current contract expires at summer of 2017. On 6 October 2016, negotiations started for the extension of his contract. Koutroubis is among the players Panathinaikos wish to tie up at the club as the two parties has begun negotiations over a new deal and the Greens are willing to offer an improved salary to the 25-year-old central defender, whose current contract expires at the end of 2016-17 season, in order to keep him in their squad. Italian manager of Panathinaikos Andrea Stramaccioni will handle personally the case of Giorgos Koutroubis' contract extension until the summer of 2019. Eventually, on 15 October 2016, the current contract of 25-year-old player that expired at summer of 2017, will be extended until that of 2019, with better financial terms (€250,000 per year) and a buy-out clause of €1,6 million.
As of 19 March 2017[update]
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