Francois Steyn has been banned for four weeks for a dangerous tackle on Jonathan Sexton during Montpellier's 57-3 defeat to Leinster in the European Champions Cup.
The former South Africa international was sent off following the 30th-minute incident and will now miss the Top 14 side's next four matches, starting with Friday's home clash with Northampton Saints.
An independent disciplinary committee upheld the decision to dismiss Steyn in the Group 4 encounter and deemed the challenge to be reckless.
Steyn's punishment could have been as severe as six weeks, but the committee reduced it to four after the 29-year-old pleaded guilty and showed remorse for his actions.
Montpellier will be without the back until early March, meaning his return will come in their league encounter against Clermont Auvergne on March 11.
Meanwhile, Leinster lock Hayden Triggs has received a three-week suspension after being cited for making contact with the eye area of Nic White in the same match.