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Bristol Bears and England prop Kyle Sinckler will miss the start of the Six Nations after being banned for two weeks for swearing at a referee.
Sinckler, 27, contested the charge of failing to respect the authority of a match official at a hearing on Tuesday.
However, it was ruled he did direct his "aggressive" language towards Karl Dickson in Bristol's win at Exeter.
His actions early in the second half of Saturday's Premiership fixture at Sandy Park were also deemed to have warranted a red card.
The British & Irish Lion will not be free to play again until 9 February, meaning he will also be unavailable for Bristol's league match against Bath on Friday, 29 January.
Meanwhile the French government has demanded to see England and Ireland's virus containment plans before it allows France to travel for Six Nations games.
"We absolutely need the necessary guarantees from these countries," said sports minister Roxana Maracineanu.
"Other nations' virus framework must respect the same requirements."
The French government has given the go-ahead to France's opening fixture against Italy in Rome on 6 February.