Schubert was honoured as the most promising player at the 2003 Champions Trophy with nine goals in six matches. Earlier that year, on 9 July, he made his debut for "The Kookaburras" in a friendly match against Germany in Neuss. He played club hockey in The Netherlands after the Athens Games, first for Kampong in Utrecht, and after the relegation for HC Klein Zwitserland in The Hague. He had to miss the 2006 Men's Hockey World Cup due to a knee injury. He also missed the 2008 Olympic Games semi-final and bronze medal play-off matches due to a knee injury sustained in the last minor round game vs Great Britain.