Boss to start as Reddan drops to the bench
Isaac Boss will partner Jonathan Sexton when Leinster face ASM Clermont Auvergne in Sunday's Heineken Cup semi-final in the Stade Chaban-Delmas (3pm Irish time).
Gordon D'Arcy will take a familiar position alongside Brian O'Driscoll at centre with Luke Fitzgerald joining Isa Nacewa - who will make his 99th Leinster appearance - and Rob Kearney in the back three.