At the end of the 2017 season, Whitehead extended his contract with Canberra until the end of the 2020 season. Whitehead made 27 appearances for Canberra in the 2019 NRL season as the club qualified for their first grand final in 25 years. Whitehead played in the 2019 NRL Grand Final at second-row as they were defeated 14-8 by the Sydney Roosters at ANZ Stadium. In 2014, Whitehead was selected in England's 2014 Four Nations squad. He was selected in the 3rd game against New Zealand. In 2015, Whitehead was selected in the England team again for the end-of-year test series against New Zealand. Before the series, Whitehead was part of the England team that took on France in a test match held in Leigh. In 2016, Whitehead was selected in the 24-man England squad for the 2016 Four Nations. Before the tournament began, he featured in a test match against France. In October 2017 he was selected in the England squad for the 2017 Rugby League World Cup. In 2018 he was selected for England against France at the Leigh Sports Village. He was selected in England 9s squad for the 2019 Rugby League World Cup 9s. He was selected in squad for the 2019 Great Britain Lions tour of the Southern Hemisphere. He made his Great Britain test debut in the defeat by Tonga.