Romelu Lukaku scored the winning penalty in Inter Milan's 2-1 win over Cagliari, but was subjected to clearly audible monkey chants from the crowd.
After the game, Lukaku took to social media and responded to the racism chants.
"Many players in the last month have suffered from racial abuse. I did yesterday too," he wrote on his Instagram account.
"Football is a game to be enjoyed by everyone and we shouldn't accept any form of discrimination that will put our game in shame.
"I hope the football federations all over the world react strongly on all cases of discrimination!
"Social media platforms (Instagram, Twitter, Facebook...) need to work better as well with football clubs because every day you see at least a racist comment under a post of a person of color.
"We've been saying it for years and still no action. Ladies and gentlemen, it's 2019. Instead of going forward we're going backwards and I thinks as players we need to unify and make a statement on this matter to keep this game clean and enjoyable for everyone."
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