In a week that could define their campaign, Leinster face Irish rivals Ulster in the RaboDirect PRO12 before heading to France for their Heineken Cup semi-final against Clermont Auvergne.
Joe Schmidt's side need just two more points to secure top spot in the RaboDirect PRO12 but with Ulster - who also have a European semi-final against Edinburgh the following week - desperately fighting for a place in the play-offs, that might be easier said than done.
And D'Arcy is adamant Leinster will have to raise the standards with so much at stake.
He said:"It is a massive game this weekend against Ulster. They made 12 changes from the weekend [against Connacht] so they are going to come out all guns blazing and they have got a semi-final the following week.
"There are a lot of subplots to this game as it is an inter-pro match - they need the win and both teams need the win before going into the big match the following week.
"I suppose you hope the best is yet to come. We know there's so much work to do between now and the end of the season.
"What has gotten here has been good enough to get us here but it won't be good enough to get us farther down the road. Work, work, work is the name of the game for the rest of the season and that starts at Ulster this weekend.
"They are showing exactly what they are capable of with a win at Thomond [in the Heineken Cup] and then with 12 changes nearly turning Connacht over at the Sportsground. It is going to be an inter-pro game which is always a massive, massive match but there's always that undercurrent of bragging rights wanting to get one over on the guys you are playing against for positions."
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