A contrite Gavin Henson claims he "fully accepts" the two-match Heineken Cup ban imposed on him by the Ospreys.
The Wales centre will miss tomorrow's Pool Three opener against Leicester at Welford Road, plus a home appointment with Perpignan next Saturday.
Henson started only his first game in six months last Sunday, when the Ospreys needed a converted injury-time try to edge out EDF Energy Cup opponents Harlequins.
The Ospreys have now omitted him from their selection plans until later this month.
Henson said: "Having received feedback from team management earlier in the week as part of a review of the Ospreys' last home game, I reacted poorly and additionally took unauthorised leave to consider the matters raised.
"Having signed up to the Ospreys' code of conduct introduced earlier this year, I was part of a disciplinary decision from the Ospreys leadership group which consists of senior players and rugby management.
"I fully accept this decision and entirely support the penalty imposed, and very much look forward to rejoining my team-mates on the field."
Henson's place in midfield tomorrow is taken by Andrew Bishop, whose centre partner will be former Ulster wing Tommy Bowe.
England Under-18 head coach John Fletcher insists his young side will be better for the experience after beating Italy in the bronze final to round out their 2015 Rugby Europe U18 Championship campaign in style.