"This team always goes out onto the pitch to win," Fernandez told reporters.
"We need to approach our next match [against Valladolid] with a high intensity. We need to think of it as a final and work to make sure we at least get a point.
"We need to rediscover our will to win and our intensity. I'm sure it will come good. I hope the supporters stay calm. We don't think we are in a terrible situation, just an uncomfortable one."
Aguirre is widely expected to leave his position as manager at the end of the campaign to step back into international football.