Conor Murray believes Ireland can produce the goods should they qualify for a World Cup quarter-final.
Coming into the tournament as the number one ranked team, Ireland impressed in the opening win over Scotland but struggled against Japan, falling to a 19-12 loss.
The subsequent bonus-point win over Russia was filled with errors that appeared to belie a team shorn of confidence.
They need to beat Samoa, with a bonus points as it stands, to guarantee qualification.
Whether that results in Joe Schmidt's side topping the pool, and therefore setting up a clash with South Africa, or finishing in second and having to deal with New Zealand, depends on the outcome of Japan-Scotland, if indeed that game goes ahead.
Asked about the confidence among the team that they can come good again, Murray told Justin Treacy on the RTÉ Rugby podcast: "Absolutely, I don't need to develop it too much.
"I know how good this team can be when we are on song.
"We keep going back to the excitement, that’s part of it too. We know how good this team can be when we are switched on and hopefully we get there.
"The majority of our game has been there and there have just been a couple of things that went astray.
"We want to perform to our potential [against Samoa].
"With the break we’ve had and the time to regenerate we come into this game really fresh, physically, but mentally there’s just a buzz that we really want to put in a really strong performance.
"It’s getting close to the business end of this competition and that’s when we want to be firing."
The Fukuoka clash with Samoa had been under threat but with Super Typhoon Hagibis moving away and heading towards Tokyo, the fixture is to go ahead as scheduled.
However, a decision on the final pool game between Japan and Scotland won’t be made until Sunday morning.
"Everyone is aware of it and it’s a bit of a weird one but the safety of players and fans is paramount," said the scrum-half, who will alongside Johnny Sexton equal the half-back partnership record held by Peter Stringer and Ronan O’Gara.
Follow Ireland v Samoa on Saturday 12 October (kick-off 11.45am) via the live blog on RTÉ.ie/Sport and the News Now App, watch live on RTÉ2 or listen to live match commentary on RTÉ 2fm.