Athletic lost 2-0 at San Mames in a game which marked a Champions League debut for many of their players.
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Vivian said afterwards: "What a debut. I couldn't be more proud of all of us, of all my teammates, of how this started. We're definitely saddened by the result.
"Competing like we did today, with the effort we put in, the sacrifice, the order in which we played..."
"We played against a great team, and that's why we missed out on points at home."