“It's not easy to score five goals against your rival, so you have to enjoy it when it happens.
"I'm really happy. It's an important result.
“The team's better than ever and this week (wins against Sevilla, Inter Milan and Real) has given us a lot of confidence.
“We've been at a great level without even having our best player."
Injured Barca talisman Lionel Messi watched the game from the stands (Image: GETTY)
Luis Suarez scored a stunning treble in Messi's absence (Image: GETTY)
Pique has come in for criticism at times this season after Barca went four La Liga games without winning before their victory over Sevilla on October 20.
But they are now back on top of the league and Pique has returned to form at the perfect time.
Boss Ernesto Valverde has very little cover at the back, with Samuel Umtiti and Thomas Vermaelen both suffering from long-term injuries.
"It was a question of time before I got back to my normal level," he added.
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Arturo Vidal netted his first goal in Barcelona colours (Image: GETTY)
"The criticism is motivation for me to re-find my best form. I felt good, the sensations are good."
The Spain international also added that he hopes to see team-mate Jordi Alba recalled in to the international squad.
He has been overlooked ever since the World Cup but put in a stellar display against Real and set up Coutinho’s goal.
"When you don't have the best player on the pitch, everyone has to take a step forward," Pique said.
"The full-backs were really good. I hope (Spain boss) Luis Enrique rectifies his error and brings Jordi Alba back into the squad."