Lucho knows how tired the 120 minute men are from the short rest, the long trip from Georgia and the considerable trip to Bilbao. He also might sub for Alves, Messi and Suarez. If resting the players who need rest costs this game and/or this cup, so be it. In the big picture, it would be irresponsible to burn out players and risk injury before the season begins.
His first team will then be in good shape for the game next Monday. They can get a good result, go into the season feeling good. With or without this minor cup.