A week is a long time in hurling, especially if you're a follower of Waterford.

Last week, the Déise were seen as the only side who could really put it up to three-in-a-row chasing Limerick. Seven days later, they know that a win on Sunday won't guarantee them hurling into June.

Victory for Cork over Tipperary at Thurles would make the result from Ennis between Clare and Waterford irrelevant. Were the Rebels to lose, then a draw would be enough to see Liam Cahill's men advance by the skin of their teeth.

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So where did it all go wrong for the Allianz League champions at the weekend against Cork?

"One thing that has concerned me, even when they're going well, is their decision-making under pressure is not good," Michael Duigan told the RTÉ GAA Podcast.

"They take the wrong option. Even the likes of Aussie [Gleeson] going back 130 yards to take a free, or taking a line ball from 90 yards, and putting it wide.

"These are the types of things that shouldn't happen but are continually happening. Grand when things are going well.

"You see when you're watching them there's an overlap there and the ball should be given and it's not. The man takes the shot and it goes over the bar maybe, but it's still the wrong option.

"Then when the pressure comes on; there was pressure on the last day to win and it didn't happen. There's been pressure on a couple of times over the last few years, and they don't respond well to it.

"That's something maybe psychological."

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Ahead of last week's defeat to Cork at Walsh Park manager Liam Cahill had called on the Waterford public to "pack out Walsh Park" for a match that he called "defining" in terms of their season.

For Duignan, it showed that Cahill had faith in his players, but the majority of the nearly 11,000 who showed up to Slievekeale Road venue on Sunday left disappointed.

"Liam Cahill put them under a fair bit of pressure. He said it was the biggest game in his time with Waterford - they didn't respond to that.

"I thought it was really clever management. I said to myself, 'He's really putting them under the spotlight. He's not worried about what Cork bring, or what happens anywhere else, or what anybody else does in another other match. We win this match and we're going through out of Munster'.

"It didn't work and that has to be worrying. You don't know how they're going to be on Sunday mentally."

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Speaking on the same podcast, Shane Dowling said the displays of Waterford, Dublin and Wexford were a reminder that you can't read too much into Allianz League form from February or March when the championship rolls around in the summer.

"I'd say Liam Cahill is devastated because he didn't foresee that coming," the 2018 All-Ireland winner added.

"It comes back to the league, what is a good year for a team? If Waterford win a league but don't get out of Munster, is that a good year? The answer is no.

"You look at Wexford, who were very good in the league, Dublin the same - all the teams that were performing well in the league are now the ones that mightn't make it out of their provinces."

Listen to the RTÉ GAA Podcast at Apple Podcasts, Soundcloud , Spotify, or wherever you get your podcasts.