In football, moving to a rival is one of the most risky things a player could do.
The supporters left behind will turn on them in the blink of an eye and fans of the new side might not take too kindly to an arrival from their deadliest enemy.
Despite this, players moving between rivals is not an uncommon occurrence and there are many examples of top footballers changing their allegiances at the drop of a hat.
Here is a look at five of the most high-profile examples, famous for their pure hatred and shock value and sure to still get supporters' blood boiling.
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