Matenga made his starting debut for Otago in their Ranfurly Shield challenge against Canterbury on 12 September 2009. He was a part of the Highlanders' wider training squad for the 2010 Super Rugby season. In 2011 he signed with Stade Montois in France. Looking for a better salary and easier rugby Matenga signed with the Kubota Spears in the Top League in Japan for the 2012-13 season.
On the 28 October 2015 Matenga was named in the Blues squad for the 2016 Super Rugby Season.