A soccer player in Portugal who tried to walk off the pitch after suffering alleged racial abuse had to be substituted by his manager to avoid a potential sanction from UEFA.

Moussa Marega was subjected to monkey chants from a section of the home crowd throughout FC Porto's 2-1 win over Vitoria Guimaraes on Sunday, according to Al Jazeera.

After scoring what proved to be the winning goal in the 60th minute, Marega celebrated by pointing to his skin and raising his middle finger at the Guimaraes fans.

The Malian striker had objects hurled at him from the crowd, and was subsequently booked by the referee for the gesture.

After the abuse continued, Marega headed for the tunnel in the 72nd minute, aiming "thumbs down" gestures at the crowd.

He was restrained by teammates who pleaded with him not to walk off, and tried to physically prevent him from leaving the field.

Rather than Marega simply being allowed to leave the field, his manager Sergio Conceicao was forced into substituting him. Had Conceicao not made the official change and allowed Marega to go through with his protest, Porto could have been subject to punishment by UEFA.

According to UEFA's three-step protocol for dealing with racism, the game must be temporarily stopped twice by the referee and fans warned about reported racist behavior before the match can be abandoned and players can leave the field.

Marega leaving of his own accord would have been a violation of that protocol, and under UEFA's current Disciplinary Regulations, it may have resulted in him forfeiting the match for his side.

When contacted by Business Insider, UEFA said it does not comment on "domestic cases as they are outside of our jurisdiction."

After the game, Marega took to Instagram to condemn those who reportedly abused him, as well as the match officials on the day.

"I would just like to tell these idiots who come to the stadium to make racist screams, go f--- yourself," he said.

"And I also thank the referees for not defending me and for giving me a yellow card because I defend my skin color. I hope I never meet you on a football field again!YOU ARE A SHAME!!!!"

Conceicao told Porto's official website that the abuse aimed at Marega was "shameful," while the division's organizing body, Liga Portugal, also denounced those responsible.

"Liga Portugal does not agree and never will with acts of racism, xenophobia or intolerance that jeopardize the dignity of footballers or any human beings," said a statement on its website.

"Liga Portugal will do everything to ensure that this episode and all other racist incidents do not go unpunished.

"We believe this is a fight where your team's colors do not matter and everyone must come together to eradicate this scourge on the game."

Porto is currently second in the Portuguese top flight, one point behind leaders Benfica.

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