Real Madrid players have suffered more racist abuse than those from other clubs, midfielder Jose Callejon said on Friday after Barcelona's Brazilian fullback Daniel Alves complained of monkey chants in Wednesday's King's Cup semifinal at the Bernabeu.

Alves said on Thursday Spain was a "lost war" when it came to tackling racism and called for stiffer punishments for clubs whose fans abused opposition players.

"The only club that has suffered a lot of insults throughout its history is Real Madrid," Callejon told a news conference previewing Saturday's La Liga match at Granada when asked about the Alves remarks.

Callejon also confirmed that there had been an altercation between assistant Real coach Aitor Karanka and Barca forward Lionel Messi after Wednesday's semifinal first leg, which ended in a 1-1 draw.

Media reports which said Messi called Karanka "Mourinho's puppet" were correct, Callejon added.

A former Real player, Karanka often stands in for coach Jose Mourinho at news conferences.

"I saw what happened with Aitor because I was behind him," Callejon said.