Career
Bundesliga. Early years
He started to play football at Football Club Hövelriege and move from there to the youth of South Carolina Verl. On 27 August 2003, the second matchday of the Oberliga Westfalen, he made his debut for the first team in the 2–3 defeat against Football Club Gütersloh. In this season, where he was still a youth player, he came to a total of ten appearances.
He showed above average performance and thus aroused the interest from clubs in higher leagues, among those VfL Bochum who signed him.
Schmidtgal had previously for promotion to the Regionalliga, the then third division, the Verl side. VfL Bochum
In Bochum, he played for the second team and did only train with the first team, which was playing in the Bundesliga.
Rot-Weiß Oberhausen
In summer of 2009, he left VfL Bochum and signed for Rot-Weiß Oberhausen the 2. Bundesliga. SpVgg Greuther Fürth
Foreign the 2011/12 season he joined SpVgg Greuther Fürth with a two-year contract.
Fortuna Düsseldorf
In 2013 he moved on to Fortuna Düsseldorf.
FSV Frankfurt
In June 2015 he signed a two-year contract with FSV Frankfurt. In 2008 Bernd Storck, the newly appointed manager of the Kazakhstan national team, researched German players born in Kazakhstan. This research revealed Sergei Karimov, Juri Judt, Konstantin Engel and Heinrich Schmidtgal.
On 3 September 2010, Schmidtgal made his debut for the Kazakhstan national team in a Euro 2012 qualifier against Turkey.
Schmidtgal was not entitled by Union of European Football Associations rules to play for the Kazakhstan national team in second qualifier game against Austria in Vienna, as Schmidtgal had not yet completed obtaining Kazakhstani citizenship and was only in possession of preliminary id (a provisional document not valid outside Kazakhstan). This issue was later resolved by Schmidtgal gaining dual citizenship (German-Kazakhstani).