Coetzee was born in Windhoek and went to primary school in Aranos before moving to South Africa to attend Hoër Landbouskool Boland in Paarl.

[2] Coetzee made his first class debut on 9 July 2010, playing off the bench in a 13–43 defeat to the Golden Lions in Phokeng in the 2010 Currie Cup Premier Division.

He also played in the Heineken Cup competition for the first time, making four appearances as Racing Metro failed to progress from Pool 2; this included one start in their match against Edinburgh.

He made another seven appearances in the 2013–14 European Challenge Cup, where he helped them to top Pool 3 with five wins and a draw to qualify for the Quarter Finals, where they lost 7–39 to English Premiership side Bath.

[12] However, he switched allegiances to his country of birth, Namibia,[13] and made his test debut for them on 6 June 2015 in their 2015 Africa Cup match against Tunisia in Nabeul.