Arnold Arnold and Bradley were injured in the Carabao Cup final against Newcastle United in the Carabao Cup final against Newcastle United.
Bradley also lost friends with Switzerland and Sweden in March.
Liverpool are 12 points clear at the top of the Premier League, including nine games left.
Brazilian goalkeeper Alison and Ryan Gravenberch are expected to be available for derby despite withdrawing from their international squad.
“Ryan is good. We have to train again, but he’s fine,” Slot said.
“Ali trained with us. The last test must be done this afternoon, after the meeting, to see if he is ready to play.