Gloucester's World Cup centre Eliota Fuimaono-Sapolu will miss the opening two rounds of the Pool 6 Heineken Cup campaign after receiving a three week suspension.
His ban means he will miss Sunday's game against French Champions Toulouse and then the home clash with English Premiership leaders Harlequins at Kingsholm in Round 2.
The Samoan star was banned from 8-28 November after being found guilty of two charges of Conduct prejudicial to the interests of the Game contrary to Rule 5.12 of the Rules of the Rugby Football Union.
A three-man RFU Disciplinary Panel chaired by Daniel White found that Fuimaono-Sapolu made or adopted from other users of Twitter, critical or sarcastic comments about the rugby disciplinary process and made, or adopted from other users of Twitter, critical comments about the Rugby World Cup and the International Rugby Board on his Twitter account.
The Panel dismissed the charge of making or adopting from other users of Twitter, insulting or provocative comments about Owen Farrell, a professional rugby player, on his Twitter account.
"The Twitter forum is not one for 'banter' and is not the equivalent of a clubhouse discussion - it is in fact a public forum, and for that reason players should be guarded in what is said and therefore endorsed," said Mr White.
"We note that over 13,000 people are registered to follow Mr Fuimaono-Sapolu on Twitter. It should be noted that young people, those learning the sport and the public at large look to people in his position and for these reasons we have imposed a sentence designed to deter others who may be tempted to act in this way."
The RFU Panel also pointed out their finding does not necessarily trigger the suspended sentence imposed on the player on 15 October by the IRB for breaches of the Rugby World Cup 2011/International Rugby Board Code of Conduct. Their decision stands alone and it is now a matter for the IRB to determine whether the actions of Mr Fuimaono-Sapolu constituted a breach of the conditions of that sanction.
On a more positive front, Gloucester have confirmed that England international full back Olly Morgan has become the latest player to commit his future to the club having agreed a three year extension to his current deal.
Morgan's decision comes hot on the heels of the re-signings of Scottish international lock Jim Hamilton, Wales second row Will James, England wing Charlie Sharples and Henry Trinder..
Morgan, who turned 26 last week, has spent his entire professional career at Gloucester. A former pupil at Millfield School, he signed his first professional contract with the club in 2004.