Video: Zenit fan punches Dinamo Moscow player during riotous pitch invasion
FIFA president Sepp Blatter has called for action from the Italian football federation (FIGC) after a banana was thrown at AC Milan defender Kevin Constant in 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 at Atalanta 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 in their match when a fan approached Dinamo captain Vladimir Granat from behind and punched him in the head.
Meanwhile, The Confederation of African Football has expressed its "deep sorrow" after at least 15 people were killed in a stampede at a match in DR Congo.
The trouble occurred at a Congolese league match between AS Vita Club and TP Mazembe at the Tata Raphael Stadium in the capital Kinshasa on Sunday.
CAF said the stampede caused a wall and gate to collapse.
It started in injury time, with hosts Vita trailing 1-0, when some home supporters threw missiles on to the pitch and the police responded by firing tear gas into the crowd.
CAF president Issa Hayatou said in a statement: "I would like to express my deepest sympathy on hearing of the untimely deaths of at least 15 people during the match of AS Vita and TP Mazembe.
"Personally, and on behalf of the members of the African football community, I should be grateful if you could extend our deepest condolences to their families, friends and loved ones. Further, we wish those that have been reported injured and receiving medical assistance full recovery.
"I wish to re-emphasise that any acts of violence have no place in football. They must be condemned in the strongest possible terms and I urge the FECOFA (the Congolese football federation) and authorities in the DRC to thoroughly investigate this matter and ensure that measures put in place to avoid a repeat of any incidents are fully briefed with CAF and forestall any such occurrence."
FIFA president Sepp Blatter said on Twitter: "Waiting for more news from DR Congo too after tragic reports. My thoughts are with all those who saw loved ones go to a game, not to return."