Victory at Sevilla marked Xavi's last game in charge at Barca.
Ter Stegen said: "We always wish Xavi the best. He has been a friend for many years and it is never easy to let him go. We will see what he has done in the coming years. I wish him the best, he deserves it.
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"We will always be with him."
He added, "Today is not the best time to talk about next season. We have players of a good level and we have to work much harder on an individual level to be in better condition and be able to compete with anyone next year."