Peter O'Mahony warns that Ireland must improve "across the board" to stay on top of the world.
O'Mahony, 33, remains a mainstay of Farrell's set-up and his performance against South Africa close to a fortnight ago underlined that.
However there is a feeling in the Ireland camp that, while beating the World Cup winners was a boost, the performance wasn't where the players and management wanted it to be.
READ MORE: Andy Farrell pays touching tribute to son Owen ahead of 100th England cap
Speaking ahead of the final Test of 2022 on Saturday, the Corkman insists there is more to come from this team.
“Yeah, absolutely, there would be a serious issue if we didn't think that we didn’t have more to give or that there wasn’t more in us," said the Munster skipper.
"Obviously, the weekend is another big test.
"There's lots of big rugby coming up and you have to be improving all the time, teams are getting better and better.
"We want to stay ahead of that curve.
"We're obviously a very ambitious group - a real hungry group of people to keep improving on performances.
"People mention the summer and South Africa but we still feel there is plenty more to go."
The Fiji game last Saturday brought everyone involved back down to earth again, just in terms of the need to strengthen depth even further as another World Cup year rolls around.
In terms of the areas where Ireland can improve, O'Mahony stated: “Across the board - in attack and defence.
"Every time we review a game, there's lots of things that we can identify very quickly that we can really make strides on across the board.
"Your intent is always to go out and play the perfect game and that's never gonna happen, but that's what you're chasing all the time. And that's what we'll continue chasing."
As for Ireland's current winning form, O'Mahony claims it is the calm setting provided by Andy Farrell and his coaches that is bringing out the kind of performances that excites fans.
Farrell has gained a lot of kudos for his guidance of the men in green since lifting them from the despair of their latest World Cup finals exit in 2019.
The former defence coach has been a different sort of head coach to predecessor Joe Schmidt, ditching the hardline approach for a more holistic one in Carton House.
But he is still making sure messages are imparted, as he did in a fuming post-match interview after the win against Fiji.
"It would be wrong to speak of him on his own, he's our head coach but there is a whole group that is very comfortable in themselves and as a collective," said O'Mahony, himself playing it cool two days out from the clash with Australia.
"They are very calm, capable of giving us direction and are very conscious of having our input - wanting us to take things on board.
"When you are invested in that as much as we are, Andy is at the top of that, you all take a huge amount of confidence from that.
"You all end up being very much aligned, where you see the group going and getting a handle on where it is at the time.
"The more people that are like that in the group, the load is spread over people. You are all very much on the same wavelength.
"Andy has done a great job from that side of things. He is certainly a very calming figure - but it's his coaching, the way he delivers his messages.
"He is a good person to be around and have in camp. He always speaks about 'the person is bigger than the group'.
"And when that person is delivering the most important messages, it’s obviously very helpful.”
Irish Rugby player Peter O’Mahony has been announced as an ambassador for Aviva Ireland. Peter is pictured at the launch of Aviva Ireland’s Christmas donation drive - for every Aviva home insurance policy sold this festive season, Aviva Ireland will donate €10 to charity through its partner, FoodCloud. Visit aviva.ie/foodcloud
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