Jerry Flannery has pulled no punches in his assessment of Munster's patchy start to the campaign, admitting the surrender in Cardiff left the camp "pretty p****d off" and searching for some answers.

Munster were swept aside by Cardiff Blues last Friday night, failing to register a score in the second half of a 37-13 defeat.

They face Ulster at Thomond Park this week in need of a big response. Forwards coach Flannery said it's effectively "an Irish trial" as players on both teams look to turn Joe Schmidt's head.

First and foremost however, he wants to see the men in red get back to basics.

"It wasn't good enough," said Flannery.

"You can't just put it down to one area. From my responsibility, our setpiece didn't function like it should have. Defensively we bled tries, first-phase tries, which are really disappointing to concede.

"And in terms of our attack we didn't convert when we got in to their 22. 

"We thought going in that if we stayed with Cardiff - they had faded in the three games previously in the second half - if we weathered the storm initially, we'd be in the mix. We were pretty p****d off."

They now get a chance to wipe that poor showing from memory on Saturday night.

Ulster, with three wins and a draw, have made a good start under new head coach Dan McFarland. Flannery is braced for a battle.

"Ulster have shown a lot of resilience in the game they've played," he added.

"They look fit. They'll be well drilled. For us it's a massive game because we haven't been good enough so far this season.

"It's an Irish derby; everyone knows each other pretty well. Obviously for the players themselves they're pitching themselves towards the national team. It's almost like an Irish trial from that point of view.

"We need to get a result and get things working again. Two from four is not good enough."