With a sell-out crowd at Thomond Park, the GUINNESS PRO12 table-toppers can anticipate an electric atmosphere on Saturday evening for their first encounter with Clermont.
But after a tense 21-20 GUINNESS PRO12 win last Friday night over Ulster - that relied on Ian Humphreys' last-gasp conversion miss - Foley admitted his side will have to step it up against France's second-placed side.
And the former Irish international urged his side to cut out the basic errors and cheap penalties that almost cost them against the Ulstermen.
"You point that out and you hold people accountable for it," Foley told the Irish Examiner.
"You make sure they know they just can't do that in the professional game. We are in a results business - it doesn't matter how we get them, it's a results business.
"You are going head to head with Clermont and you can't give them any leg up. Let them create their own opportunities.
"We'll have to create our own so let them create their own, let's not give them anything.
"That has been where our focus was this week; not giving them anything, making sure our discipline is right.
"We also need to be ruthless. You get nine points ahead of a side, you don't take your foot off their throats.
"If we get momentum into this game we keep the pressure on and we don't come off it.
"On the head-to-head everyone knows it is played over 160 minutes, but what we have to do is deal with these 80 minutes and that we make sure we are properly prepared."
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