Sigalas played for Olympiakos BC from 1992 until 1997 winning five consecutive league titles, two Greek Basketball Cups and the Euroleague championship in 1997. He left Olympiakos in 1997 joining Italian League club Stefanel Milano. The following year he returned to Greece to play for Aris BC (1998 - 2001). Afterwards, he transferred to cross-town rivals PAOK BC (2001 - 2002), Spanish club CB Granada (2002 - 2003) and Italian side Viola Reggio Calabria at the end of the 2003 season.
Sigalas played for the National Basketball Team of Greece in 185 games and was captain of the national squad for many of those games. He scored 1487 points as an international for the National Basketball Team of Greece.
Since retiring, Sigalas has become a basketball commentator and also works as a coach for the national youth Greek basketball teams.
Awards and accomplishments
- Won 5 consecutive Greek League Championships 1993-1997 with Olympiakos
- Won 2 Greek Basketball Cups 1994, 1997 with Olympiakos
- Won the Euroleague Championship 1997 with Olympiakos
- Won the Triple Crown in Basketball 1997 with Olympiakos
- Greek A1 League All-Star 1997, 1999
- Greek A1 League regular season MVP 1996
- Greek A1 League playoff MVP 1996
- FIBA EuroStars selection 1996
- Acropolis Tournament MVP 1999
- Euroleague player profile and stats