In 1997, while playing with Olympiacos, Sigalas won the Triple Crown, meaning his team won the Greek League championship, the Greek Cup, and the EuroLeague championship, all in the same year, the only time it has happened in the club's history.
In 1997, while playing with Olympiacos, Sigalas won the European basketball Triple Crown, meaning his team won the Greek League championship, the Greek Cup title, and the European-wide top-tier level EuroLeague championship, all in the same season. As of 2017, it is still the only time it has happened in the club's history.