In Round 2 of the 2006 NRL season, Cooper made his NRL debut for the Cowboys in their 20–16 victory over the Manly Sea Eagles.
ɪn ɹˈaʊnd tˈuː ʌvðə tˈuː θˈaʊzənd sˈɪks ˌɛnˌɑːɹɹˈɛl sˈiːzən, kˈuːpɚ mˌeɪd hɪz ˌɛnˌɑːɹɹˈɛl deɪbjˈuː fɚðə kˈaʊbɔɪz ɪn ðɛɹ twˈɛnti sˈɪkstiːn vˈɪktɚɹi ˌoʊvɚ ðə mˈænli sˈiː ˈiːɡəlz.