Exeter centre Joe Hawkins has been banned for three weeks after his red card at Bayonne.
The 21-year-old was sent off after 77 minutes in the Champions Cup loss for a dangerous tackle on Federico Mori.
Hawkins, who has won five caps for Wales and moved to Exeter in the summer from Ospreys, was handed the suspension after a disciplinary hearing.
The ban will be reduced to two weeks provided he completes a World Rugby coaching intervention.
He will miss the Premiership game with Saracens on Saturday and a friendly game with Scarlets a week later.
Should he successfully compete his coaching intervention he will be available for the Premiership Rugby Cup semi-final against Gloucester on 17 February.