Miller picked up a slight shoulder injury in training on Wednesday and with the Heineken Cup just over a week away coach Gary Ella has decided not to take any unnecessary chances. Des Dillon takes over at wing-forward and Niall Breslin comes onto the bench.
Down south the injury plague to international players continues with John Kelly and Anthony Horgan both ruled out of this evening's Musgrave Park clash between Munster and Cardiff Blues. Both were named in Alan Gaffney's side but Kelly picked up an achilles injury and Horgan damaged a hamstring which leaves them sidelined for a game Munster must win to keep alive their hopes of Celtic League glory.
Mossie Lawler and Shaun Payne are called into the starting XV with Martin McPhail and Dominic Crotty promoted to the bench.
Leinster Lions: Girvan Dempsey; John McWeeney, Brian O'Driscoll, David Quinlan, Gordon D'Arcy; Felipe Contepomi, Brian O'Meara; Reggie Corrigan capt, Shane Byrne, Peter Coyle; Malcolm O'Kelly, Ben Gissing; Des Dillon, Keith Gleeson, Victor Costello
Ulster: Bryn Cunningham; James Topping, Ryan Constable, Paul Steinmetz, Tyrone Howe; Adam Larkin, Neil Doak; Simon Best, Matt Sexton, Rod Moore; Matt Mustchin, Rowan Frost; Andy Ward capt, Neil Best, Roger Wilson.
Munster: Jeremy Staunton; Mossie Lawlor, Mike Mullins, Jason Holland, Shaun Payne; Ronan O'Gara, Peter Stringer; Marcus Horan, Frankie Sheahan, John Hayes; Donncha O'Callaghan, Paul O'Connell;Jim Williams capt, David Wallace, Anthony FoleyReplacements: (from) Simon Kerr, Jerry Flannery, Trevor Hogan, Stephen Keogh, Colm McMahon, Eoin Reddan, Rob Henderson, Martin McPhail, Dominic Crotty.