MANCHESTER UNITED fans taunted Porto keeper Diogo Costa for his incredible blunders – after the Red Devils nearly signed him.
Costa fumbled in shots from Marcus Rashford and Rasmus Hojlund to leave United 2-0 up in the Europa League clash.
And one Red Devils supporter labelled the Portugal star a “double agent”.
Costa has been linked with United over the past two years – as well as Chelsea over the summer.
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