Career
His regular position is lock. Youth
Sonkosi first represented Eastern Province at the 2010 Under-18 Academy Week tournament. He played for the Eastern Province U19 side in the 2011 Under-19 Provincial Championship competition and for the Eastern Province U21 side in the 2012 and 2013 competitions, winning the Under-21 Division B title on both occasions.
Eastern Province Kings
He made his senior debut for the Eastern Province Kings in the 2014 Vodacom Cup by starting in their 17–10 opening day defeat to Kenyan side Simba XV. He scored his first try in senior rugby in his second match two weeks later, against Western Province in Cape Town.