Palace won't put out youth players for the risk of getting hammered, but they have so many injuries they have no real choice other than to play close to a first team
I expect he'll rest one or two that he didn't need to, but hey ho. Palace may well pick quite a strong squad because they have so many injured they may have little choice in a derby game.
Meanwhile its more about giving the fringe payers match-time than resting the first team, imo. However...