"We just need a bit of luck," Young said. "I think we were the better team against Sale, and that's encouraging. We've got a little bit left in the tank, and if everyone lifts their personal game by 10 percent, that will make a big difference collectively."
The Blues played in front of more than 10,000 fans at Sale's Edgeley Park, and skipper Martyn Williams is hoping for a big turnout at the Arms Park.
"It's a massive game," the British Lion backrower said. "If we can get a big crowd in, it lifts the players 10 or 15 percent."
A loss to Leinster will consign Cardiff to their ninth consecutive Cup defeat - equalling the "record" held by Scottish side Borders and Italian minnows Padova,
Cardiff Blues; R Williams; T Shanklin/N Walne, J Robinson, M Allen, C Morgan; I Harris, R Powell; J Yapp, G Williams, D Crompton, C Quinnell, Andrew Moore, D Baugh/J Brownrigg, M Williams (capt), N Thomas.
Replacements; B Evans, L Phillips, H Senekal, J Brownrigg/R Sowden-Taylor, Andy Moore, N Robinson, N Walne/D van Vuuren.
Leinster Lions; G Dempsey; J McWeeney, B O'Driscoll, S Horgan, G D'Arcy; C Warner, B O'Meara; R Corrigan (capt), S Byrne, P Coyle, M O'Kelly, B Gissing, E Miller, K Gleeson, V Costello.
Replacements; D Molloy, G Hickie, D Dillon, S Jennings, B O'Riordan, D Quinlan, B Burke.
Referee; Joel Jutge (France)