Cronin back in green again
Ireland have a score or two to settle with Wales in the Six Nations.
Likewise, Leinster and Munster were stung by those dastardly Scarlets in the PRO12 League play-offs last season.
It all contributes to an uneasy feeling, at least outside of Carton House, about how Ireland will cope on Saturday.
"I think it has come from the fact the Scarlets have been on such a good run, had a good win over us in the semi-final and then they went onto beat Munster in the final.
"That has created a nice spice there in itself where it creates a good competition and rivalry," said Seán Cronin.
The Leinster hooker has found his form just as Rob Herring has run into an injury and Niall Scannell returned from one.
When Cronin was left out of Ireland's November series, it did not come as a surprise.
"They were pretty honest," he said.
"They said, 'look, we just didn't think you hit the ground running, you haven't been playing too well whereas other guys were playing really well'.
"It was a good motivator for me to get out there.
"I am at the stage in my career now where I focus on what I have, rather than what I don't have.
"I am just trying to do the best I can."