Bristol flanker Mitch Eadie has been banned for six weeks for "physically abusing" the referee during Saturday's Championship match at Ealing.
The 23-year-old ex-Scotland Under-20 back rower was cited for "intentionally or recklessly pushing him or otherwise making contact" with the official.
He pleaded guilty to a charge of acts contrary to good sportsmanship.
Bristol, who won the game 26-21, are second in English rugby union's second tier, one point off top spot.
The Ashton Gate outfit have finished each of the past two seasons as league leaders, but have missed out on promotion to the Premiership, after losing play-off finals to London Welsh and Worcester Warriors.