Hull were reported to be battling it out with Newcastle to sign Harewood before the closure of the transfer window but it looked like the Tigers were set to win the race - signing the 30-year-old on loan until January with a view to a £2million permanent switch.
However, Harewood's agent Phil Sproson has revealed that, after agreeing terms with the striker, Hull pulled out of the deal.
"Having taken the call from Phil I really thought the deal was going to happen, but that's football and this is what can happen on deadline day," Sproson told the Hull Daily Mail.
"I travelled to Villa having spoken to Phil and they were happy for the deal to go ahead and it was all sorted at their end.
"I tried calling Phil back during the afternoon several times, but we heard nothing more.
"It is strange as Hull seemed interested when we spoke early in the afternoon, but Marlon will move on from this and will bounce back.
"If Hull had wanted this deal Marlon would be there now, that's 100 per cent."
The failure of Tigers striker Daniel Cousin to secure a move to Premier League rivals Burnley has been mooted as a reason for the collapse of Harewood's switch.
Prem Relegation 2009/2010 Win Outright: Hull 10/11