 On 31 August 2011, Piiroja signed a one-year contract, with an option of extension for another season, at Eredivisie side Vitesse.On 18 February 2013, Piiroja signed for China League One team Chengdu Blades.Piiroja made his international debut for the Estonia national team on 21 November 1998, in a 1–2 loss against Armenia in a friendly, replacing Viktor Alonen in the 85th minute of the match.