	He was also part of the Wigan team who defeated NRL champions, the Cronulla-Sutherland Sharks 22–6 to win the World Club Challenge, which ensured Oliver would join father Ian (who was an interchange in the 1987 and 1991 wins) as a World Club Challenge medal winner. Oliver also scored a try in that game. After starting the season is great form he broke three vertebrae in his back following a Brett Ferres 'crusher' tackle. Gildart was ruled out for three months. He returned with a try against the Leigh Centurions on 8 June. He scored a few weeks later against the Warrington Wolves followed by a brace against Leeds. In the Challenge Cup semi-final against Salford he scored another brace and went on to score another try in the 2017 Challenge Cup Final defeat by Hull F.C. at Wembley Stadium. 