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 [REF].
Wernars later made his senior debut in March 2010 for Western Province in a List A match against Easterns in the 2009/10 CSA Provincial One-Day Competition, with him making a further appearance in that season's competition against Boland [REF].