Harlequins' Will Skinner has been banned for two weeks after his red card in their Heineken Cup win in Toulouse.
The flanker, 27, committed 'an act contrary to good sportsmanship' when, on the bench after being subbed, he prevented a quick Toulouse line-out.
A European Rugby Cup (ERC) statement said Skinner's "excellent record" was considered in reducing the suspension from a possible four weeks.
Skinner will now miss the Premiership clashes against Saracens and Exeter.
The ERC statement continued: "For red card hearings, the onus rests with the player to demonstrate the referee's decision to issue the red was wrong. The judicial officer found the player had not demonstrated that, and he accordingly upheld the red card.
"Employing the IRB-recommended sanctions for acts contrary to good sportsmanship, the judicial officer decided the offence was at the low-end entry point of four weeks.
"Having taken into account the mitigating factors, including the player's excellent record, he decided on the maximum reduction of 50% and imposed a suspension of two weeks."
After missing the festive period, Skinner will be available again for Quins' Premiership match at Northampton on 6 January and their final Heineken Cup pool matches against Gloucester (14 Jan) and Connacht (20 Jan).