In March 2015, Velleman was named in an extended South Africa Under-20 training group as part of their preparation for the 2015 World Rugby Under 20 Championship. He featured for them in a friendly match against a Varsity Cup Dream Team in April 2015.&lt;ref name="Varsity Cup XV 24-31 South Africa U/20"&gt;&lt;/ref&gt; He was included in the S.A. Under-20 squad that toured Argentina in May 2015 and started their first match, a 25–22 victory over Argentina. He didn't feature in the second match and also missed out on the final squad for the 2015 World Rugby Under 20 Championship.