Career
Internationally, Piiroja represented Estonia and was the team"s captain. He made 114 appearances for the team, scoring 9 goals. He was known for his impressing ability in the air for winning headers.
Piiroja started his career in his hometown Pärnu before joining the Tallinn side under then manager Teitur Thordarson.
In 2003, he joined Norwegian side Vålerenga on loan before signing a permanent contract with. In 2006, he scored two goals in the Norwegian Football Cup final against Sandefjord in a 3–0 victory.
In 2010, Piiroja scored 2 goals in the Norwegian Premier League promotion play-offs against Hønefoss. Piiroja made his international debut for the Estonia national football team on 21 November 1998 at the age of 19 in a 1–2 loss against Armenia, replacing Viktor Alonen on the 85th minute of the match.
Piiroja became the national team captain after Mart Poom retired in 2009.
He made his 100th appearance in a 2–0 friendly victory over Uruguay and finished his international career in 2015 with 114 appearances and 9 goals scored. International goals Club Individual.