5) Cristiano Ronaldo
Another player who made it clear he had ambitions to leave at some point, Manchester United managed to keep Cristiano Ronaldo until the end of 2008/09, though he informed them of his desire to join Real Madrid the year before.
6) Robin van Persie
When he posted a message on his website explaining his decision to quit Arsenal, Robin van Persie gave the Gunners little negotiating power as he ended up joining rivals Manchester United in a hugely controversial move.
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