FIFA president Sepp Blatter has called for action from the Italian football federation after a banana was thrown at AC Milan defender Kevin Constant during a match at Atalanta.
Blatter also demanded a response from the Russian federation after a Zenit St Petersburg fan attacked an opposition player during a pitch invasion which caused the abandonment of their home match against Dinamo Moscow.
"Racism, and games stopped/abandoned due to acts of hooliganism. Each Federation needs to act. Sanctions are available & HAVE to be applied," Blatter said on Twitter.
Sunday's Serie A match at Atalanta saw European football tainted by racist behaviour for the third weekend running.
The incident comes after Barcelona's Dani Alves took a bite from a banana thrown at him and Levante's Papakouli Diop was subjected to monkey gestures.
Zenit were trailing 4-2 late on in their match on Sunday when a fan approached Dinamo captain Vladimir Granat from behind and punched him in the head.
Meanwhile, Portuguese winger Toni Silva has claimed he was the victim of racial abuse from an opponent while playing in the Bulgarian league at the weekend.
The 20-year-old, who spent three years on Liverpool's books before joining CSKA Sofia from Barnsley in December, accused Botev Plovdiv defender Veselin Minev of making repeated racial slurs against him during a goalless draw on Sunday.
"This continued throughout the whole match," Silva, who also played for Benfica and Chelsea during his youth career, was quoted as saying.
"He showered me with all sorts of insults; he called me monkey most often. He said I should go to pick bananas."
CSKA said they would notify the Bulgarian Football Union about the alleged incidents and file a complaint.
Botev and the club's defender Minev, capped 19 times by Bulgaria since 2009, were not immediately available for comment.