Juan Antonio Pizzi believes Valencia were able to beat Barcelona at Camp Nou by taking the game to their hosts.
The home side went in front after seven minutes but Los Che levelled before half-time, then took the lead shortly after the break.
A Lionel Messi penalty, disputed by Valencia, put Barca level but Paco Alcacer restored the visitors’ advantage.
Valencia held on to record what Pizzi told reporters was a much-needed victory, and the Coach was clear about how the win was engineered.
“In the first-half we lacked aggression and in the second-half we had it,” he said.
“In the second-half we had control and didn’t suffer in defence against all of Barca’s dangers.
“This win is a very big boost for our soul.
“For our next games we must use the same dose that gave us confidence to win here.”
Pizzi added that he was unsure if Barca’s penalty was rightly awarded, but revealed his players were certain it was an incorrect call.
“In the dressing room there are people convinced it was not a penalty.
“This is an error we’re not complaining about because the result favoured us, but it could have been a decisive decision.”
Pizzi also added to the condolences for Luis Aragones, who passed away on Saturday.
“I was lucky to have him as a Coach,” Pizzi said.
“I’ve learned from the legacy he has left as a Coach and for the way we work and live.”