So it was that James King who played. Saw the team list and wondered.
So what have we got.
Byrnes (Russia), Phipps (Aus), Vuna (Aus), Weeksy (Aus), Jones (Aus), Rokobaro (Fiji), Veainu (Tonga), Betham (Aus), McMahon, (Aus), Toby (Aus) and King (USA) all making international debuts after playing for us. Have I missed anybody?
EDIT: Eddie played for Tonga too.
Highlander35 as far as I know you are right these are the 12 players to have made their test debut during or after their time with the Rebels.
Of the 95 players according to my calculations 42 have played test rugby at any time (ie so quite a number before they joined the Rebels). 24 Wallabies, 4 All Blacks, 2 England, 1 Ireland, 1 Wales, 4 Japan, 2 Tonga, 1 Samoa, 1 Fiji, 1 Russia, 1 USA)
17 players have played test Rugby whilst playing with the Rebels (or in the same season they played with the Rebels eg Veainu at end of 2015 when 2015 was his last season at Rebels)
Wallabies - Beale, Gerrard, Higginbotham, Jones, McMahon, O'Connor, Phipps, Smith, Vuna, Weeks
Japan - Horie, Inagaki, Sa'u
Tonga - Aholelei, Veainu
Fiji - Rokobaro
Russia - Byrnes