Maybe in years to come Manchester United fans will look at their missing out on Karim Benzema with a wistful sigh.
Click the image on the right to launch our guide.
Ditto, Manchester City fans could regard their missing out on Kaka as the moment they should have had.
But which are the nearly-transfers which will always induce a sigh and a long stare into the middle distance? Here's our run down of the 'if only' transfers.