The team just had a bad night in front of goal, according to the coach.
“This (defeat) doesn’t change anything,” Del Bosque said. “It doesn’t take away the good work we have done so far.
“I don’t want to be a pessimist.”
Marca expressed its concern, writing in Wednesday’s headline: “With six days to go before the Euro 2016 debut, Spain fall 1-0 to Georgia, ranked 137th in the world.”
The publication filled its front page with “We cannot have lapses of concentration”, repeating it over and over as if a schoolboy had been punished and told to write it on blackboard.
El Mundo Deportivo’s headline was “Serious warning before the Euro”.
Winners of the European Championship in 2008 and 2012 as well as the 2010 World champions, Spain begin their title defence against the Czech Republic on June 13 in Toulouse.
Spain also take on Turkey and Croatia in Group D.
“We cannot go to the tournament with any doubts and we must go without any fear,” Del Bosque added.