Rees and Attwood handed bans
Wales scrum-half Richie Rees will miss this season's entire RBS 6 Nations Championship after being hit with a 12-week ban.
And Gloucester lock Dave Attwood has been ruled out of England's opening two Six Nations games against Wales and Italy next month due to a nine-week suspension.
Both players were cited for foul play after Heineken Cup and Amlin Challenge Cup matches just before Christmas.
Cardiff Blues star Rees was reported for making contact with the eyes/eye area of Northampton's England hooker Dylan Hartley during a Heineken pool clash between the teams.
And Attwood faced a complaint that he stamped on La Rochelle prop Petrisor Toderasc in a Challenge Cup clash at Kingsholm.
Both players have the right of appeal, but nine times-capped Rees is currently sidelined until March 31, while Attwood is out until February 21.
Rees is Wales' current scrum-half bench cover for Mike Phillips and would have been an important part of head coach Warren Gatland's Six Nations plans. The 27-year-old pleaded not guilty to the citing complaint on the basis that any contact made with Saints skipper Hartley had been accidental.
Independent judicial officer, Irishman Pat Barriscale, reviewed evidence at Thursday's Dublin hearing, including several angles of the incident from television footage and medical statements relating to Hartley's injuries.
He also heard telephone evidence from Hartley, and submissions by Rees, Blues chief executive Robert Norster and European Rugby Cup disciplinary officer Roger O'Connor. Barriscale determined that Rees was guilty of foul play, although he found contact with Hartley had been reckless and not intentional.
Attwood, meanwhile, admitted the charge he faced at an independent ERC disciplinary hearing. The 23-year-old toured Australia with England last summer and did not feature in the two-Test series, but he made his international debut as a replacement against New Zealand at Twickenham two months ago.