Roberto was whistle by Barca fans as they were beaten 3-0 in their opening Champions League group game.
“It hurts me a lot personally because I know him as a person, he's a great human being and loves this club more than anything," said Pique.
“I would like to remind people he's not a full-back, either, and he's making a huge sacrifice by playing there. It hurts a lot.
"People are free to express their opinions, but if you're asking me, it hurts a lot."
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