Du Preez started in Munster opening two games and Horan in the next two so there's an obvious pattern there. Given that Wallace's unfamiliar role at blindside against Glasgow was just his first game back and considering the form to date of Ronan, that reasoning behind that choice is evident.
Meanwhile, Leinster field their strongest possible side although they claim a doubt remains about Jonny Sexton who has been bracketed with Isa Nacewa at 10 pending their Captain's Run and how he comes through that. Expect to see him run out with the rest of the side.
Munster: P Warwick; D Howlett, L Mafi, S Tuitupou, J Murphy; R O'Gara, T O'Leary; W du Preez, D Varley, J Hayes; D O'Callaghan, D Ryan; A Quinlan, N Ronan, D Leamy capt. Replacements: S Henry, M Horan, Darragh Hurley, M O'Driscoll, D Wallace, P Stringer, S Deasy, D Hurley.
Leinster: R Kearney; S Horgan, B O'Driscoll, G D'Arcy, L Fitzgerald; J Sexton/I Nacewa, I Boss; C Healy, R Strauss, M Ross, N Hines, D Toner, D Ryan, S O'Brien, J Heaslip (capt). Replacements: J Harris-Wright, H van der Merwe, S Shawe, M Galarza, R Ruddock, E Reddan, I Nacewa/I Madigan, F McFadden.