Araujo saw red as Barca lost 4-1 at home and were eliminated from the Champions League at the quarterfinal stage.
The Uruguay defender posted to social media: "The football that gave me so many joys, now hits me hard.
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"I thank all those who are unconditionally by my side, my colleagues who left everything on the field, and the fans who believed in this team until the end.
"I am very sorry not to give you this joy. We will try again.
"Fora Bara, ara i semper! God in control #psalmos30_5"