After tournament success with the under-16s and 17s, Wisdom continued to progress through the national ranks and joined up with Noel Blake's Under-19 squad during the 2010–11 season. He made his debut versus Slovakia in October and went on to make ten appearances for the side over the following two years. He failed to add to his success at younger age groups after the side failed to qualify for the 2011 UEFA European Under-19 Championship tournament and Wisdom missed out on the final squad that reached the semi-finals of the 2012 tournament.