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A report in Spain last week claimed Barca transfer chief Robert Fernandez had watched the 19-year-old in action against Athletic Bilbao with a view to launching a bid to sign him as future competition for Jordi Alba.
Marin, however, has dismissed the rumour and says he will not become distracted by any talk of a possible move.
"The truth is that I don't know anything," he said, as quoted by Marca. "I got up and saw they were talking about me on the news but I think it's nothing more than a rumour and I don't pay it any attention.
"I'm just focused on working every day with my team-mates to keep improving and gain experience, together with my team and the technical staff.
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"As it's a rumour, I don't give it any importance."
Marin has made nine appearances for Marcelino's side so far this season.