Leicester, England and Lions prop Julian White been banned for eight weeks by an RFU disciplinary panel.
White gets his marching orders at Welford Road
The punishment came after White was sent off for fighting with Newcastle's Andy Perry during a Premiership match.
White cannot return until 12 December, meaning he misses four Premiership and two Heineken Cup clashes.
Leicester can appeal but may opt not to especially as White could conceivably have been suspended for a longer period. Perry got a four-week ban.
The three-man panel accepted Perry's offence was committed under extreme provocation and in self-defence, but still decided the former Marine had a case to answer.
He is suspended until 16 November, missing European Challenge Cup games against Brive and Borders, plus Premiership appointments with Gloucester and London Irish.
Newcastle have decided not to appeal against the ruling.
Director of rugby Rob Andrew said: "We have reluctantly decided not to appeal the suspension. We are disappointed with the verdict and feel we have been very hard done by, but we just have to move on."
Perry and White were also ordered to pay £250 costs towards the hearing.
White - already suspended by his club - issued a statement on Monday apologising for his conduct during the 16-16 Premiership draw at Welford Road.
The World Cup winner said: "I very much regret the incident. I feel that I have let everybody down - most of all the club, my team-mates and our supporters.
"I have found the last few days very difficult, and would like to apologise unreservedly for my actions."
White will miss Leicester's first three Heineken Cup games - against Clermont Auvergne, Stade Francais and the Ospreys.
He is also unavailable for Premiership games against Worcester, Gloucester, Sale and London Irish next month, and a Powergen Cup tie against Northampton.
White, who started all three Tests for the Lions in New Zealand this summer, had already been omitted from England's 30-man autumn Test squad.