World footballers' union FIFPro has called on the Italian authorities to cancel Sulley Muntari's yellow card for complaining to a referee about alleged racial abuse from fans during a Serie A game on Sunday.
The 32-year-old Ghanaian walked off the pitch in protest after being shown a yellow card for apparent dissent in the 90th minute of Pescara's 1-0 defeat at Cagliari.
But the former Portsmouth and Sunderland midfielder had been trying to explain to referee Daniele Minelli that a group of Cagliari fans had been allegedly racially abusing him.
In a written statement, FIFPro said: "We urge the Italian authorities to hear Muntari's version of events, investigate why the situation was mismanaged and take firm action to ensure this never happens again.
"FIFPro believes Muntari's yellow card should be rescinded. Muntari was well within his rights to approach referee Daniele Minelli, as the first point of reference, to make his grievances known and seek a solution.
"Players should feel comfortable bringing any issue to the attention of the referee, especially one as significant as allegations of racism in the workplace.
"No player should ever feel the need to take matters into his own hands, as Muntari clearly felt obliged to do, by abandoning the match or taking spectators to task for inappropriate behaviour.
"Professional footballers should expect to be adequately protected by the relevant authorities in a place of work that does not tolerate discrimination of any kind."
Speaking to Italian television after the match, Muntari said he had been abused by a group of fans in the first half but had tried to defuse the situation by giving one of the group, a child, his shirt "to teach him you're not supposed to do things like that".
The former Inter and AC Milan star, who also played 84 games for Ghana between 2002 and 2014, said the abuse continued in the second half so he tried to speak to Minelli.
Muntari said: "He told me that I'm not allowed to speak to the fans. I asked him: 'But didn't you hear?'"
"I told him he should have had the courage to stop the game. The referee's not just there to stand on the pitch and blow his whistle - he has to manage everything. He should also listen out for that kind of thing and set an example."