It's a strange world, that of football.

Regardless of how useful a player could be to a team, no matter how desperately they need a new striker or a new goalkeeper, fans would refuse to see certain players lining up for their club.

For some it's association with a long-standing rival, for others it's a controversial past.

In other instances, the player may not sign for a club because of his advanced years.

Here we take a look at five signings that really should happen but, for one reason or another, almost certainly won't. 

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