Shamrock Rovers did a number on Santa Clara in the Azores last week, but they have another job to do tonight if they are return to the league stages of the Conference League.
Stephen Bradley's men came from 1-0 down to win 2-1 in the play-off first leg against a team that finished fifth in the Portuguese top flight last season.
Danny Grant and Dany Mandroiu got the goals on a great night for the Hoops, who were calm and clinical in key moments.
Now they're aiming to finish the job at Tallaght Stadium (8pm kick-off).
How they try to do that will be intriguing. Bradley has shown he's tactically flexible with a couple of systems up his sleeve to suit the occasion. He'll also be hoping to exploit chinks in Santa Clara's armour.
"Their two centre-halves are slow enough to be fair," said ex-Shamrock Rovers and St Pat's goalkeeper Barry Murphy on this week's RTÉ Soccer Podcast.
"Bar their threats up front, they're fairly agricultural in the middle. They were prepared to let Rovers get on the ball and Rovers have a way of playing in Europe now. Darragh Nugent comes in and plays; he doesn't play in the home legs in Europe, doesn't play a lot of league games but he kind of plays that Park Ji-Sung-type role.
"When you play with that flat three in front of the back three as well, it's really hard to come up against.
"Rovers will be disappointed with the goal they did concede, it was the first time they had a foray into the Santa Clara half in the first 15 minutes and that's where they gave up the goal, a long ball out to the left, really good touch and a good finish.
"Rovers were sound enough in their defensive display, but I do think they caught Santa Clara on the hop a little bit."
Graham Gartland agrees that the Hoops should expect an improved showing from the opposition.
Bradley got his tactics spot on in the Azores. However, the surprise factor is gone now, and if Santa Clara were guilty of complacency in the first leg, they are very unlikely to make the same mistake again.
"When they're at home, generally what Rovers will do, their wing-backs will engage with the opposition full-backs up the pitch and they trust the back three and say look, we've enough pace that yous aren't going to hurt us," Gartland said when analysing the SSE Airtricity Men's Premier Division leaders' approach.
"In Europe (Bradley has) changed that a little bit. They look a lot more dangerous on the counter-attack at times as well.
"Santa Clara will be coming here knowing they got a little bit of a fright. They probably did underestimate Shamrock Rovers. They probably looked down their nose a little bit at them, but I think this is going to be a really tough game.
"They know what to expect now, but Shamrock Rovers have had some great nights in Tallaght. Hopefully for the league it's another one."
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