Yamal's father, who was stabbed several times in a car park in the Catalan town of Mataro on Wednesday night, was in a serious but stable condition.
According to Catalan police, a fourth individual is being actively sought.
For more football news, go to News24 Sport's dedicated section.
Three people have been arrested and a fourth is wanted after a knife attack on the father of young Spanish football star Lamine Yamal in Catalonia, local police told AFP on Thursday.
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