Wharton went down with a knock to his ankle during Sunday's final Premier League game against Arsenal and was later substituted as a precaution.
It was a game Richards also missed with an ankle injury.
Joined by captain Dean Henderson and Yéremy Pino at his pre-match press conference, Glasner said: "I don't want to tell you yet if they can start or not.
"But they were available today in training and that's a good sign. We still have 36 hours before the game and the medical department will work hard \[to get them ready\]. They will work hard until late into the night.
"At the end of the day, we will nominate the starting XI who are 100% fit.
> I will talk to them again tomorrow morning
>
> —Oliver Glasner
"I will talk to them again tomorrow morning and if the player doesn't feel 100% fit, then they won't start.
"They have pain, but I think many of the players have pain at the end of a long season. Everybody wants to participate.
"So the final decision will be taken tomorrow.
"I definitely know we will start with 11, and a different 11 will end the game. We need every single player ready to help the team."
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**Crystal Palace v Rayo Vallecano**
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