Shaun Treeby has been suspended for three weeks after pleading guilty to a dangerous tackle on Piers Francis during Stormers' 30-22 Super Rugby victory over Blues on Friday.
The centre escaped punishment on the field for the challenge in the 47th minute that saw his swinging arm catch Francis on the chin, leaving the Blues number 10 knocked out and concussed.
Despite the leniency from referee Jaco van Heerden and TMO Shaun Veldsman, Treeby was subsequently cited by SANZAAR for what the citing commissioner deemed was at the "red card threshold for foul play".
His case was reviewed by the governing body's foul play committee on Sunday, and could have earned a six-week ban.
However, due to Treeby's early guilty plea and excellent judicial record the panel halved his punishment.
The Stormers will only be without his services for one Super Rugby match - against the Sharks next Saturday - with the South African franchise not playing again until early July.