Ulster Prop John Afoa has been handed a four week ban for a dangerous tackle on Felix Jones during their win over Munster in last weeks Heineken Cup quarter final.
It means the All Black will miss the semi final against Edinburgh at the Aviva the weekend after next.
Afoa will be available for the final against Leinster or Clermont if Ulster get through.
In Rabo direct pro 12 rugby
Leinster coach Joe Schmidt has made 12 changes to his team for tomorrow nights meeting with Ediburgh at the RDS.
Damian Browne makes his 20th appearance of the season and partners Devin Toner at lock, with Sean Cronin joining Heinke van der Merwe and Nathan White in the front row.
Boss and Madigan come into the half backs.