Araujo has been missing since being sent off in Barca's Champions League defeat at Chelsea last week.
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Indeed, the defender hasn't trained with Barca since last Tuesday.
This morning, Flick would only offer: "Ronald isn't ready. It's a private matter, and I won't say more. I ask that you respect that; that's all I can and will say."
After the midweek clash with Atletico, Barca meet Real Betis on Saturday.