Before making his senior debut at any level, Wernars was selected to play for South Africa Under-19s, making his Youth One Day International debut against Sri Lanka Under-19s in December 2009 in a tri-series which also involved India Under-19s.
[2] He was selected as part of South Africa Under-19s fourteen man squad for the 2010 ICC Under-19 Cricket World Cup which was held in New Zealand in January 2010,[3] with Wernars making six appearances during the tournament.
[6] It was in that season that he also made his debut in first-class cricket against Boland at Newlands in the 2009/10 CSA Provincial Three-Day Competition.
[7] The following season he made a further first-class appearance for Western Province against KwaZulu-Natal in the 2010/11 CSA Provincial Three-Day Competition.
[12] Sussex were invited by the West Indies Cricket Board to take part in the 2011–12 Caribbean Twenty20 in January 2012 as an overseas team.