Career
Katsoulis began his career with Association for the Study of Internal Fixation Dramas. He then played with PAOK, from 1974 to 1988, having a leading role in the team With Aris, he also played in two Euroleague Final Fours (1989 Munich and 1990 Zaragoza).
In 1990, he moved to Iraklis, and in 1993, he moved to Makedonikos.
With Greece"s senior men"s national team, he had 165 caps, and he scored 1,371 points (83 per game). He was also the captain of the Greek senior national team
He also played at the EuroBasket 1979, the EuroBasket 1981, and the EuroBasket 1983.