Wessels is ruled out for South Africa's autumn internationals.
Springbok front-rower Wessels faces a suspension of nine games for grabbing opponent Josh Murphy's genitals during the Blue Bulls' URC victory over the Irish province.
This event took place in the 18th minute of the narrow victory against Connacht on last Friday, with Connacht forward Murphy receiving a temporary dismissal after responding aggressively by hitting the South African on the head.
After the Connacht player complained to the match official, the situation was checked by the television match official, who found no conclusive video evidence.
The Bulls player remained on the field until he was replaced in the later stages of the game.
While the United Rugby Championship announced that the Irish player's 20-minute red card was withdrawn by a disciplinary panel, the Springbok was found to have violated the code of conduct, which specifies:
"Any athlete should not do anything that is contrary to the principles of fair play. This includes touching, pulling or squeezing the private areas."
Disciplinary officials determined that the incident reached the red card threshold and justified a 12-week suspension, the shortest suspension under World Rugby rules for such an offence.
Nonetheless, Wessels' suspension was reduced by 21 days because of his good conduct prior to and at the proceedings and his good record.
Wessels and the Bulls have the right to challenge the decision, but as it stands, the ban will prevent the 24-year-old out of the South African national team's autumn Tests against the Brave Blossoms, Les Bleus, the Azzurri and the Irish team.
Wessels will also miss the Bulls' URC games against Warriors, the Lions and the Cell C Sharks, as well as European cup games with Bègles and Northampton.
The prop has earned ten international appearances for the Springboks and was included in their tri-nations champion team over the summer.
The Connacht player, in contrast, is eligible to face Munster in Saturday's domestic clash after being exonerated.
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