He quickly became a regular and he was paired in defence alongside players such as Nikos Kostenoglou, Carlos Gamarra, Mauricio Wright, Vangelis Moras and Traianos Dellas, with whom they also formed the national team's defensive duo.

In 2001, where he was fined for his involvement in a training ground incident with Ilias Atmatsidis,[1] as AEK surrendered the championship to Olympiacos in the final matchdays of the season.

There was often speculation about his future at the club, and he was allegedly offered as an exchange in a failed transfer bid for PAOK's Dimitris Salpingidis.

In February 2007 Kapsis moved to Cyprus to play for APOEL in Nicosia, and helped the club win the champion title race in 2007.

Kapsis made his debut for Levadiakos in the Super League on 31 August 2008 against Aris at the Kleanthis Vikelidis Stadium.

The following season he played his first match against Kavala, where he faced his former teammates in the national team, Fanis Katergiannakis and Vasilios Lakis.

In February 2010 Kapsis returned to Ethnikos Piraeus, as he desire to play for the team where he debuted as a professional player before retiring.

Kapsis with his great performances at a club level, earned a call-up in 2003, to play for Greece in the critical UEFA EURO 2004 qualifying matches against Spain and Ukraine.

Afterwards, he was naturally included in the squad of UEFA Euro 2004[5] that ended up winning the tournament and in particular Kapsis achieved a great performance.