The SANZAAR judiciary said it took Barrett's exemplary disciplinary record into account before clearing him to play.
The current World Rugby player of the year was sent off late in the match after receiving two yellow cards for deliberately knocking down the ball during Waratahs' attacks.
The SANZAAR judiciary said it took Barrett's exemplary disciplinary record into account before clearing him to play against the Auckland Blues this weekend.
"The player is therefore free to play and will serve no suspension," it said in a ruling issued late Monday.
Barrett argued after the match that he was trying to intercept the ball but poor technique meant he knocked it down, rather than taking possession.
Waratahs prop Sekope Kepu was banned for one week after earning a yellow card in the same match for a dangerous tackle.
The judiciary said he received the suspension because it was his third yellow this season for similar offences.