The Japan Professional Football League said on Friday it had decided to fine Yokohama F Marinos five million yen ($A52,150) over racist behaviour by one of their supporters.
Yokohama banned the teenager indefinitely soon after he waved a banana towards a Brazilian player in the match against Kawasaki Frontale on August 23.
Yokohama said the fan admitted his behaviour towards Kawasaki's attacker Renato was an "act of provocation" during the 2-0 win.
The incident came about five months after the J-League forced Urawa Reds to hold a game behind closed doors as a penalty for their supporters displaying a racist banner at a stadium entrance, which was not removed until after the March 8 home game.
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