The pair know eachother from the Bundesliga.
Richards told Palace's website: "Centre of defence, preferably.
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It was a lot of learning this year, playing right-back, centre-back, centre-mid.
(It was) a lot of positions that I'm not quite used to, but again, like I said, I'll do whatever to be on the pitch and help us win. I think it's been good to play in different positions because you learn a lot.
We played against (Glasner's) teams in Germany, so I think he remembers what my best position was.
But coming in, we did have a small conversation, and he just kind of said that for the future he sees me playing centre-back
All the games I played for him have been at centre-back."