Wasps number eight Nathan Hughes has been banned for three weeks after being found guilty of recklessly kneeing Northampton Saints winger George North.
The collision knocked the Welshman out on Friday and gave him his third concussion in the space of four months. Hughes was shown a red card for the incident and will now be out of action until April 28.
"This was a three-week ban on the basis that no intention was found. However, there was recklessness meaning that, notwithstanding the harm, it was a low entry point of four weeks with mitigation of one week to reflect his previous clean playing record," Sir James Dingemans, chairman of the disciplinary panel, told the Daily Mail.
Northampton Saints won the match 52-30 to stay at the top of the Aviva Premiership table.