Sources told Goal UK that the Red Devils are pressing ahead with plans to sign the versatile Ajax star, who played under new manager Louis van Gaal with Netherlands at the World Cup this summer.
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"There hasn't been any offer for Blind yet," he told NU.nl.
Jansen added that Chelsea youngster Marco van Ginkel, whose debut season was disrupted by a long-term injury, could leave the club on loan this summer in search of regular football.
"Van Ginkel could be loaned out but we will find out more in the last week of August," he said.
Norwich City midfielder Leroy Fer is another of the company's clients, and the Netherlands international, who was relegated along with the Canaries last term, is drawing attention but Jansen says Neil Adams's side is resisting a sale.
"There is interest for Leroy Fer, but Norwich aren't cooperating at the moment," he said. "He can go to another English club or to another country."