"We have the advantage of our experiences last year. It all went wrong for us last season as well. We hope that history will repeat itself and we can go back up the league," he told AS.
"The enthusiasm for the Champions League is not lost. We can't forget what has happened to this club. We have to go into every European game remembering that tough past.
"We have a real chance to make history. I trust this team and in the work we do. I'm sure we'll be back near the top of the league."
Agirretxe has been with Sociedad since 2003.