Even more so after last nights RaboDirect PRO12 results, it’s a case of three into two won’t go in the race for the one remaining play-off spot.
And with Munster clinging onto the coat tails of fellow contenders Scarlets and tonight's opponents Ospreys, there is only one outcome that will keep their Rabo ambitions intact after this joust with the title holders.
Ospreys have only lost one of their last seven RaboDirect PRO12 games, away to Connacht – who Munster face next – while Rob Penney's side has lost three out of the last four games they've played and that respective form is why Munster find themselves in the unusual position of outsiders with the bookies in their own back yard.
Maybe worringly too, Ospreys are making all the right noises as they head for Limerick. Their prop Cai Griffiths, back from London Irish on a loan he hopes will become permanent, expects a backlash but talks also of an Ospreys desperation for victory.
“It's always a dangerous place to go.” he told The South Wales Evening Echo. “Munster are a quality side and we're not taking too much notice of their recent results.
“Sometimes it doesn't happen for a number of games and you can't put your finger on what is going wrong. Then, bang – you turn it around, get four tries and forget what's happened in the previous couple of weeks. We just hope it will not be this weekend because we are desperate for a win ourselves.
“We're just looking to go there and do a job on them. It's about ourselves, not anyone else.”
Munster welcome back skipper Doug Howlett and internationals Ronan O'Gara and Dave Kilcoyne and they give a first start to Cathal Sheridan.
What's needed is a performance light years removed from what was delivered against either Scarlets or last week Treviso.
And even then, it may just come down to whoever gets that little rub of the green.
Munster: F Jones; D Howlett, C Laulala, J Downey, D Hurley; R O'Gara, C Sheridan; D Kilcoyne, D Varley, S Archer; I Nagle, B Holland; P Butler, T O'Donnell, J Coughlan. Replacements: M Sherry, W du Preez, BJ Botha, D Foley, S Dougall, D Williams, I Keatley, I Dineen.
Ospreys: R Fussell; T Habberfield, J Spratt, A Beck, T Isaacs; M Morgan, K Fotuali'i; D Jones, S Baldwin, C Griffiths; A Wyn Jones capt, L Peers; J King, S Lewis, J Thomas. Replacements: M Dwyer, M Thomas, D Arhip, I Gough, D Baker, A Ellis/S Davies, R Webb, T Grabham.
Referee: Nigel Owens.