Kings coach Darryl Sutter said after the morning skate that Richards was "50-50."
Richards has been out a week with a concussion he suffered late in Game 1 on a hit from Chicago's Dave Bolland.
Richards didn't take part in the morning skate Thursday before Game 4 which seemed to indicate some regression in his condition but his appearance in the skate Saturday morning suggests he's feeling better.
"It's progress," said Sutter said before the game. "(But) I don't want to say anything, I said it last time prior to Game 2 that he was playing and then he didn't ... we nearly had to make more than one change. I'll just stay away from it and follow (NHL concussion) protocol."