How do I sub a player in clash?

I have a team but one of them can't make it today. I want them to be on my team tomorrow though. Can I sub them for someone else for just today?
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We're testing a new feature that gives the option to view discussion comments in chronological order. Some testers have pointed out situations in which they feel a linear view could be helpful, so we'd like see how you guys make use of it.

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