Katsabis started his career as a midfielder but when he was played at PAOK, Angelos Anastasiadis tried him as a centre back because of his height.
In his second season for the club he featured in 30 matches and scored 3 goals,[3] but Panionios suffered relegation to the Beta Ethniki.
Panionios was a firm favorite for promotion in the next season, and Katsabis propelled the club to winning the Betta Ethniki championship by scoring 11 goals in 31 games.
[3] After the Greek Cup success Katsabis along with other teammates (Vokolos, Nalitzis, Fyssas), attracted the attention of the top clubs in Greece.
Katsabis captained the club in the final, a match held in Nikos Goumas Stadium, Athens that found PAOK victorious against Olympiacos by 4–2.
[3] In his last season for the PAOK he played in 25 matches and scored 2 goals[3] helping the club to achieve its 6th consecutive UEFA Cup qualification.
In a match against Atromitos, on 10 September 2010, in Peristeri Stadium Katsabis made his 400th appearance in the top tier of Greek football (Alpha Ethniki or Superleague).
[8] Katsabis debuted for Greece as a starter in a 1–0 win against Belgium on 5 February 1999 in Neo GSZ Stadium, Larnaca.