Last week the Ghana midfielder, who plays for top-flight Italian team Pescara, said he was "treated like a criminal" after receiving a one-match ban, which was later rescinded, for objecting to being racially abused during a Serie A game.

On April 30, the 32-year-old had left the field in protest during a match against Cagliari in Sardinia after being booked for complaining of being abused by a section of fans.

If the treatment of Muntari has received worldwide attention, it seems to have had little effect on some fans who attend Serie A games.

Muntari was on the substitutes' bench for his club's home game against Crotone in the Stadio Adriatico Sunday and said he could hear a player being abused.

Asked how often incidents of racism happened in football, Muntari told CNN Sport: "Every game. I was sitting down [Sunday] and it was happening. There was a player playing and it was happening in the stands so how are we going to tackle this?

"This isn't the first time it has happened. We talk about it and after maybe one week, two weeks it's gone. Then, maybe after a month or two later, it happens somewhere and you get calls to talk about it and then it's shut again."