Stade Francais wing Josaia Raisuqe will not play again this season after he was hit with a 10-week ban for stamping on Ospreys teenager Keelan Giles.
Raisuqe was shown a yellow card following the incident and was later dismissed during Stade's 25-21 European Challenge Cup victory at the Principality Stadium.
Ospreys coach Steve Tandy said Raisuqe ought to have seen red after clashing with 19-year-old flyer Giles midway through the first half.
Raisuqe was cited and has now been hit with a suspension that will keep him out until at least August 7.
The 22-year-old and European Professional Club Rugby (EPCR) has the right to appeal against a sanction that was issued by an independent Disciplinary Committee.
An EPCR statement said: "Following recent sanction guidelines concerning kicks and stamps to the head, the Committee was required to find that the offence was at the top end of World Rugby's sanctions, and 12 weeks was selected as the appropriate entry point.
"One week was added due to Raisuqe's recent disciplinary record, and then taking into account the player's timely apology to Keelan Giles as well as his admission that he had committed an act of foul play, the Committee reduced the sanction by three weeks before imposing a 10-week suspension.
"At the earliest, Raisuqe will be free to play on Monday, 7 August, however, the suspension could extend to a later date subject to confirmation of Stade Francais Paris' forthcoming playing schedule. Both the player and EPCR have the right to appeal the decision."