Wessels is ruled out for South Africa's upcoming test matches.
Springbok front-rower Wessels has received a ban of nine games for grabbing Josh Murphy's genitals during the Bulls' URC victory over the Irish province.
This event took place in the 18th minute of the Bulls' 28-27 win in Galway on Friday, with opposing player Josh Murphy being shown a 20-minute red card after responding aggressively by hitting the South African on the head.
Following the Connacht player complained to referee Mike Adamson, the situation was examined by the television match official, who concluded no definitive proof.
Wessels stayed on the pitch until he was replaced in the second half of the game.
While the URC confirmed that the Irish player's 20-minute red card was rescinded by a disciplinary panel, the Springbok was found to have violated the code of conduct, which states:
"A player should not do anything that is contrary to the principles of fair play. Such behavior covers touching, pulling or compressing the private areas."
Disciplinary officials concluded that the contact met the level for dismissal and warranted a three-month ban, the minimum ban under international rugby rules for such an infringement.
Nonetheless, Wessels' suspension was shortened by 21 days because of his good conduct prior to and at the proceedings and his clean disciplinary history.
Wessels and the Pretoria-based team have the right to appeal, but currently, the suspension will prevent the 24-year-old out of the South African national team's autumn Tests against Japan, France, Italy and Ireland.
He will also miss the Bulls' league matches against Glasgow, the Emirates Lions and the Sharks, as well as Investec Champions Cup games with Bègles and Saints.
Wessels has won 10 caps for South Africa and was part of their tri-nations champion team over the summer.
Murphy, meanwhile, is eligible to play against the Irish rivals in Saturday's domestic clash after being exonerated.
