The Barcelona midfielder sustained the cut following a collision with goalkeeper Juan Musso while attempting a header, an incident that has sparked debate despite Musso’s explanation.
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After returning to Catalonia, Lopez required further treatment as initial dressing-room care proved insufficient.
The 22-year-old had played 68 minutes, covering eight kilometres and missing a clear chance before being substituted for Marcus Rashford.
Although Barcelona won 2-1 on the night, they were eliminated 3-2 on aggregate. He now faces a short recovery period to prevent infection after an already bruising week that included another facial cut.