The 49-year-old first-team coach is set to hold talks over his position at Old Trafford after David Moyes was appointed as Sir Alex Ferguson's successor on Thursday
The 49-year-old originally joined United in 2001 before leaving for Brondby in 2006, although the Dutchman returned to Old Trafford less than a year later.
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"When Ferguson leaves, then we are going to brainstorm about my role at Old Trafford," he told De Telegraaf.
"I don't know what happens now. I am uncertain about the future."