He was an integral part of Greece's Euro 2004 winning squad, during which he assisted the only silver goal ever scored in an international football match.

Although he was famed for his lackadaisical playing style, his ability was never in question and he was in many ways the epitome of a classic "number 10" player.

Tsiartas began his career at the academy at AE Alexandris and later the team of Naoussa, which also produced players such as Vasilios Lakis and Dimitris Markos.

His performance for Naousa, gained the interest of the big teams, mainly AEK Athens and Panathinaikos.

[1][2] He showed samples of his rare class with a characteristic debut on 12 December 1992, in which he scored two goals in a 7–0 victory against Korinthos in Nea Filadelfeia.

[22] Having played at under-16 and under-21 level, Tsiartas made his debut for men's team on 27 April 1994 in a game against Saudi Arabia.

He tallied three assists during the preliminaries and led all Greek players in total goal contributions as Greece finished atop their qualification group.

During the Euro 2004 finals, he was mainly deployed as Greece’s super-sub by Otto Rehhagel, making four total appearances throughout the tournament.

Despite never starting, Tsiartas still managed to claim two vital assists at Euro 2004, the first being a group stage equalizer versus Spain, and the other resulting in the first and only ever silver goal against the Czech Republic in the dying minutes of the semi-final match en route to Greece's ultimate victory.