Another classic piece of scheduling has two of Ireland's four provinces going head-to- head with the national side -- at much the same time, never mind the same day.
For Connacht it's a tough trip to Swansea even allowing for the absence of 16 Ospreys on international duty. The home team haven't lost a league game in the Liberty Stadium to non- Welsh opposition since Leinster in September 2009.
At least Connacht are on something of a roll having won their last four games in all competitions, including their first ever back-to-back successes in this competition. Adrian Flavin for Seán Cronin is the only change to the side that beat Glasgow last time out.
Munster head back to Italy for the second time in a fortnight, though with the less daunting prospect of Aironi, a second loss is unthinkable. The midfield combination of Warwick, Tuitupou and Mafi alone should be enough to keep them safe at the top.
Ospreys: R Fussell; T Prydie, S Parker, A Beck, H Dirksen; D Biggar, R Webb; D Jones, H Bennett, C Griffiths, I Gough, I Evans, T Smith, J Collins, J Tuperic (capt). Reps: M Davies, R Bevington, C Cross, A Lloyd, J King, T Isaacs, D Flanagan.
Connacht: G Duffy; B Tuohy, N Ta'auso, T Nathan, F Carr; I Keatley, F Murphy; B Wilkinson, A FLavin J Hagan, M Swift, M McCarthy, A Browne, R Ofisa, J O'Connor (capt). Reps: D Murphy, R Loughney, R Ah You, B Upton, M McComish, C Willis, M Nikora, K Matthews.
Munster: J Murphy; D Hurley, L Mafi, S Tuitupou, S Zebo; P Warwick, D Williams; W du Preez, D Varley, T Buckley, I Nagle, M O'Driscoll (capt) J Coughlan, T O'Donnell. Reps: D Fogarty, M Horan, S Archer, B Holland, A Quinlan, C Murray, D Cusack, D Howlett.
Sunday Indo Sport