Mathieu Flamini scored a first-half goal but was later sent off in a bad-tempered 1-1 Serie A draw on Sunday between AC Milan and Napoli, third and second respectively.
The Frenchman fired Milan ahead at San Siro with a left-foot shot from the edge of area in the 29th minute and Goran Pandev levelled for the visitors four minutes later.
But Flamini was dismissed for a studs-up tackle on Juan Camilo Zuniga in the 72nd minute.
Napoli stayed four points clear of Milan, who look increasingly as if they will have to settle for a third-place finish and a place in the Champions League qualifying rounds next season.
Napoli, meanwhile, are still eight points behind leaders Juventus, who visit Lazio on Monday.
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