On 30 May, Cooper was announced as Queensland's 18th man for Game 1 of the 2016 State of Origin series.
ˌɔn θˈɜːɾi mˈeɪ, kˈuːpɚ wʌz ɐnˈaʊnst æz kwˈiːnsləndz ˈeɪtiːnθ mˈæn fɔːɹ ɡˈeɪm wˈʌn ʌvðə tˈuː θˈaʊzənd sˈɪkstiːn stˈeɪt ʌv ˈɔːɹɪdʒˌɪn sˈɪɹiz.