Off contract in June, it was claimed Mazraoui had agreed pre-contract terms with Barca this week, with technical chief Jordi Cruyff spending time in Amsterdam.
But he said, "I still haven't signed anything with Barcelona.
"There's nothing concrete, I'm not even close to doing it. Otherwise I'd be honest and say it."
Bayern Munich and Borussia Dortmund are also interested in Morocco international Mazraoui.
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