Munster suffered the worst possible preparation for next weekend's Heineken Cup semi-final at Toulouse as they slipped to a 15-11 Magners League defeat against Ospreys.
Ospreys have impressed to lie second in the league this season but the Welsh region had never won at Thomond Park and Munster head coach Sean Holley made his intentions clear with an all-star line-up.
But Ospreys fly-half Dan Biggar was in clinical mood with the boot and kicked five penalties from five as Munster slipped to a second consecutive home Magners League defeat for the first time in seven seasons.
Biggar’s opposite number and Irish international Ronan O’Gara was enjoying less success from the ground and missed two penalties as Munster found themselves 6-3 down at half time.
Another three penalties from Biggar stretched Ospreys’ lead to 12 with James Coughlan’s yellow card on 51 minutes making matters worse for the hosts.
Welsh captain Ryan Jones’ late yellow card allowed Munster back in as O’Gara crossed to reduce the deficit to four with ten minutes remaining.
But the Red Army couldn’t find a way through at the death and remain fourth in the league with a final match at Cardiff Blues in two weeks likely to decide their play-off fate.