The Ajax technical director insisted that any suitors will have to pay the "absolute top price" for the midfielder this summer and said no concrete offers have been made
There has been a great deal of speculation surrounding the versatile midfielder, with the Red Devils being heavily linked to the 24-year-old who was voted the Eredivisie player of the year last season.
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"We believe that we currently have a strong team and want Daley to stay for another year," he told De Telegraaf.
"Only if the absolute price is paid is a transfer negotiable.
"Daley's management know how we feel at the moment. Next year we will have a much more lenient policy, we are willing to talk with Daley and we will settle for a reasonable price."
The former Arsenal forward also insists there has been no contact with the Premier League club.
"There's some rumblings around Daley, some clubs enquired, but there is no concrete offer. And with Manchester United, there is no contact at all."