United asked after Fermin during negotiations over Marcus Rashford's loan move to Barca last week.
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Now Sport says United are following up with a formal bid of €70m for Fermin.
Both Barca and Fermin now are discussing their next move, though any response isn't expected in the coming days. Instead, Barca and the player will take their time to consider their options before going back to United.
United are set to make their offer official this coming week and will push for a swift response.