Both came off the bench in last week's victory over the Scarlets - which took the defending champions back to the top of the RaboDirect Pro12 table - and both scored tries.
But Foley expects no let-up from his side.
"There's a good mindset, there's a good attitude in the side. They don't give up. They don't give anything to the opposition without them having to earn it," said Foley.
"For the young lads they're learning their trade and applying their trade very well out there. If you judge them off the first three league games you'd have to be impressed. But we want more.
"We're kind of selfish in that manner in that we want bigger performances from these guys. And by demanding more in training and by them being self critical hopefully we can push it on to another level."
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