Wales star Lee Byrne is considering his next move after being hit with a ban that will rule him out of the Six Nations clash against England at Twickenham next Saturday.
Byrne has remained with the Wales squad at their rural training retreat in the Vale of Glamorgan. He has until Monday afternoon to lodge any appeal.
A two-week suspension was imposed on the Ospreys full-back following his appearance as an illegal 16th player during the Welsh region's Heineken Cup victory over Leicester last weekend.
Byrne admitted a misconduct charge, lodged by European Rugby Cup disciplinary officer Roger O'Connor, as did the Ospreys, who were fined $25,000.
But Leicester's hopes for the Pool Three clash to be replayed were quashed by an independent disciplinary committee in Dublin. The committee ruled there had been "no material effect on the match," meaning the 17-12 result stands and Ospreys will meet Biarritz in the Heineken Cup quarter-finals on April 10.
Leicester, led by their chief executive Peter Wheeler and chairman Peter Tom, made an official complaint to ERC after the second-half incident at Swansea's Liberty Stadium.
Byrne, who went off with a bloodied toe and was replaced by Sonny Parker, returned three minutes later without any of his Ospreys team-mates initially going off.
Leicester claimed Byrne was then involved in helping to halt a break by scrum-half Ben Youngs as Tigers looked to claw back a five-point deficit. Out-half Dan Biggar eventually departed the action, as Ospreys moved back to 15 players.
In a statement, ERC said: "The independent disciplinary committee found that Mr Byrne had re-entered the pitch without the referee's permission and that he knew, or ought to have known, that he needed that permission.
"The committee found that this represented a clear breach of the substitution protocol and that the club could have done more to ensure that such a breach did not occur.
"However, the committee found that the breach had not been deliberate or premeditated on the part of the club's management, and that there had been no material effect on the match."