Ulster were facing an early European exit after back-to-back defeats against Leicester and Toulon, before a 24-9 bonus-point triumph over Wayne Pivac's side last weekend revived their chances.
Despite a number of injuries, Neil Doak's side are able to call on Ireland centre Luke Marshall, with the 23-year-old recovering from a medial knee injury in time for the crucial return fixture.
And with Ulster requiring nothing less than three wins from three to keep their quarter-final hopes alive, Gilroy insists his side will thrive under the pressure.
"As a squad we work very well together and rally strongly and as long as you keep that up on the pitch it's not that difficult," Gilroy told the Irish Examiner.
"It's a case of win or bust. It will certainly be a different kettle of fish over there. They went home pretty disappointed after last Saturday and they will be a lot more up for it this weekend.
"While it's a home game for them, we feel we are in a better place. We came off the pitch last week so satisfied with what we had done. You just cannot let those high tempo teams play or they will give you problems.
"We will just have to remain disciplined which we did very well last week added to an excellent defensive display where our scrambling was really good.
"Sometimes we can be our worst enemy allowing our opponents back into it. There were a few sloppy mistakes which we have hopefully rectified in training.
"We were virtually written off, but there is some light and we are back in the mix again."
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