Barcelona's Gerard Pique says he would "never" work for Real Madrid, speaking out against the values of people in charge of his club's chief rivals.

Talking to reporters in Paris following Spain's 2-0 win over France on Tuesday, Pique alleged someone at Real Madrid has been causing troubles for his Barcelona teammates Lionel Messi and Neymar, possibly referring to the duo's recent legal troubles.

"I don't like the values Real Madrid transmit, although there are players there I really appreciate with and am friends with," Pique said. "I don't doubt Raul's loyalty to Madrid, but I'd never work at Real Madrid.

"What I don't like about Real Madrid is how those in the box seats pull the strings. The person who accused Messi and Neymar and who has a different treatment for Cristiano [Ronaldo] is in those box seats.

"I don't know the name of the judge. We aren't going to keep a [grievance] list like [Jose] Mourinho does. We know how this works. Like this one, there are others."