Doesn't sound like Rieder practiced yesterday so I figure they'll send him down and bring someone up to be the 13th forward for tonight and maybe play on Thursday.
There is talk that might just be for roster flexibility and Rieder will stay up, which makes me wonder why he didn't skate yesterday.
Edit - And now seeing that he is there and will play tonight. Guess he was on the ice yesterday?
https://twitter.com/user/status/1189203346130903041