Nikos Liberopoulos

In summer 1996, he signed for Panathinaikos. With them he reached the semi-final stage of the UEFA Champions League. Italian clubs, mainly Juventus and Hellas Verona showed interest in hiring him, but his loyalty to Panathinaikos kept him in Athens. In 2003, Liberopoulos clashed with Panathinaikos' board which eventually led to him leaving the club.

Following his departure from Panathinaikos he was ready to join Sochaux but he finally chose his childhood club AEK Athens where he became a formidable offensive player and inspirational leader. He went to score several times against his former team but never celebrated earning the fans' applause and a standing ovation for his action. He helped AEK Athens scoring 79 times in his 195 appearances and earning a top scorer award during the 2006–07 season. His most important goals originated from two long range shots, the one against Lille OSC (AEK Athens won 1–0) and the other against Olympiakos F.C. (AEK Athens won 4–0). During June 2007, Liberopoulos was offered a lucrative contract with 1. FC Nürnberg worth 4 million euros, which he declined to remain with AEK Athens. Club president Demis Nikolaidis had publicly announced his intent to retain Lymperopoulos at all costs in an effort to bolster AEK Athens' chances at achieving dominance in the Greek Super League. On 7 July 2008, Liberopoulos was released by AEK.[3] German team Eintracht Frankfurt announced his signing on 13 July 2008.

Liberopoulos signed a two-year deal and received the number 10 shirt. He made his German Bundesliga debut for Eintracht Frankfurt, playing the full 90 minutes against Hertha BSC on 17 August 2008 at the Commerzbank-Arena in Frankfurt. Liberopoulos scored his first goal against Mainz 05. He won 55 caps scoring 13 goals in all competitions.

Liberopoulos again signed for AEK Athens in the summer of 2010 and put in an impressive display in AEK's 5–3 win against Australian A-League club Sydney FC on 25 July 2010, scoring one goal and setting up two others. Liberopoulos also scored against Blackburn three days later. He made his Superleague Greece debut against Kerkyra and scored his first official goal in a UEFA Europa League match against Hajduk Split. On 19 January 2010, in a Greek Cup match against Panathinaikos he scored two goals leading his team to victory. Liberopoulos was applauded during his substitution later in that game by some of Panathinaikos' fans despite their team's defeat. After the match Liberopoulos said "I have spent seven nice years in Panathinaikos in which I matured as a player. I keep only the positive things, but now for me AEK is my family and I will do everything for the team." and about the Panathinaikos' fans ovation "It means a lot to me. It's a great feeling to be applauded during your substitution. There were some hoots also but even if the whole stadium was hooting at me that would not have changed what I have said earlier about my feelings for Panathinaikos".[4] On 30 May 11, Liberopulos won his first trophy in his career with AEK winning the Greek Cup 2010–11 against Atromitos 0–3 while also scoring the first goal and was awarded MVP of the match.

On 16 June 2011, Liberopoulos signed a new one-year deal keeping him at the club until 2012.[5] Also, his teammate Traianos Dellas decided to stay for one year in AEK in order to stop his professional career with his best friend, Nikos Liberopoulos.

On 20 May 2012, he had his last match with AEK against Panathinaikos. A lot of Panathinaikos and AEK fans respected him with a standing ovation when he was exiting the stadium.