Leinster have received a boost ahead of their Champions Cup quarter-final against Saracens after Owen Farrell was handed a five-game ban.
The England captain was red carded for a dangerous tackle in their English Premiership clash against Wasps last Saturday.
And after facing an online disciplinary hearing, he accepted the ban that will see him miss out on the crucial September 19 clash as well as a potential semi-final.
He was dismissed for a reckless tackle on 18-year-old replacement full-back Charlie Atkinson in the second half of the Allian Park clash, which resulted in the teenager being knocked out.
Atkinson will not return for two weeks due to concussion return to play guidelines.
After Tuesday night's verdict, independent panel chair Mike Hamlin said: "It was accepted by the Rugby Football Union, the player and the panel that the offending was reckless and not intentional.
"This was a totally unacceptable contact with the neck/head of Charlie Atkinson as a result of a reckless tackle which had the consequences of him being knocked unconscious and sustaining a concussion.
"This resulted in the panel concluding that this was a top end offence with an entry point of 10 matches. There were no aggravating features.
"Testimonials provided by (Saracens director of rugby) Mark McCall, (England head coach) Eddie Jones and the founders of a charity with which the player works very closely were of the highest quality.
"The panel concluded that applying the off-field mitigating factors, notwithstanding his suspension four and a half years ago, the player was entitled to a reduction from 10 matches to five meaningful matches."
