Rory Arnold won't be pulling on the gold jersey come June 9, suspended for three weeks following his high shot on Lions flyhalf Elton Jantjies.
ACT were on their way to an upset in Johannesburg when Arnold hit Jantjies with a high swinging arm in the 60th minute, a tackle which saw him sent for an early shower by referee Nick Briant.
Arnold was subsequently charged with contravening Law 9.13, which states "a player must not tackle an opponent early, late or dangerous".
He pleaded guilty and was handed a three week plea, reduced from the midrange entry point of six weeks by SANZAAR's foul play review committee.
"With respect to sanction the foul play review committee deemed the act of foul play, a dangerous high tackle, merited a mid-range entry point of 6 weeks," Nigel Hampton QC said.
"However, taking into account mitigating factors including the player's excellent, clear, disciplinary record, his expressed remorse and his guilty plea at the first available opportunity, the foul play review committee reduced the suspension to 3 weeks.
"The player is therefore suspended for 3 weeks, up to and including the Saturday 9 June 2018."
The suspension will eliminate Arnold from Wallabies coach Michael Cheika's calculations for the first Test against Ireland, which is at Suncorp Stadium on June 9.