The Italians had won four of their last five Champions League games, and were leading 1-0 at half-time however, they crumbled against the Spaniards in the five-goal thriller.
“It is difficult to explain this performance, as the first half was perfect, we did everything we had prepared against a team we knew would come here to defend and counter, we created chances, took the lead, could’ve had a second,” Palladino told Sky Sport Italia.
“Then at half-time we said in the dressing room that we had to maintain the same spirit, but inexplicably this equaliser was like a killer blow.
“We had a blackout and conceded a series of goals that we never concede. We weren’t expecting that, the intention was to score a second, we have to show more maturity in the Champions League, because you get punished for every error.
“This is football, an equaliser can happen, but you need to stay in the game and not do this. It leaves a bitter taste in the mouth.”