Tigers chairman Paul Duffen and manager Phil Brown agreed a fee with United for the England Under-21 international three weeks ago and also reached an accord in principle with the player over his personal terms.
But Campbell, who spent a successful spell on loan at the KC Stadium during the 2007/08 season, is still to put pen to paper having been away on international duty at the European Under-21 Championship in Sweden.
Reports of interest from Sunderland have put the switch in some doubt, while Campbell is still to finalise the terms of his departure from Old Trafford.
Keith Campbell, who represents his son, insists he has only held talks with the Tigers and claimed part of the delay is down to the Reds.
"I've spoken to two people. I've spoken to Paul Duffen and I've spoken to Phil Brown, and they're the only two people I've spoken to," Campbell snr said.
Asked if his son remained keen to join the Tigers in a club record deal, he added: "Definitely. It's just purely and simply down to Manchester United, when they sort themselves out then it's fine."
Although Hull are eager for the transfer to be finalised, Campbell will spend some time on holiday before committing his future, having only just returned from Sweden.
His father said: "There are no deadlines at all.
"Fraizer has played a lot of football and we are going to go off and enjoy the holiday, have a discussion while we're away and see where it takes us."
Should United keep hold of Campbell? Have your say
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Showing comments 1 to 11 and replies | View All
Peter Doherty. As good as it gets. (Debt free) , Levenshulme (02/07/2009 at 12:49)
phil columbine (02/07/2009 at 14:43)
so if you ask nicely, fergie might let you talk to him and for say £25m
BritBoyInFL, Florida (02/07/2009 at 15:28)
Is It Me? (02/07/2009 at 16:38)
John- still Sheikhin' all over (02/07/2009 at 17:18)
swap SAF for Brian Horton.
no, you need the money.
tick tock.
paul leigh (02/07/2009 at 17:53)
Good luck mate
By the way City tried to hijack Berbatov from us and failed miserably. Now they might get Tevez off us. I will happily have a bet with anyone that Berbatov will do better than Tevez next season!!
Rick Jenks, Bury (02/07/2009 at 19:03)
hughesy80, London/Manc (02/07/2009 at 20:45)
Roll on the start of the season so we can continue to have a laugh at their expense!
Sean Lehy (02/07/2009 at 23:04)
unitedeverywhere (06/07/2009 at 02:45)
The Red C, Denmark (06/07/2009 at 09:48)