Before Pedri was sent off late on, the Barca midfielder called for a red card for Bellingham after he was fouled by the Real ace.
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In response, Bellingham mocked Pedri, stating: "Not even with Negreira".
The England international was referring to the refereeing scandal Barca are fighting involving former ref chief José María Enríquez.
Alleged payments made by Barca to Negreira and his companies between 2001 and 2018 are being investigated by a local court. During the Clasico, Real Madrid home fans chanted "Negreira, Negreira" - a theme that was eventually picked up by Bellingham, who now speaks fluent Spanish.