4. Michael Ballack to Bayern Munich AND Chelsea
Bayern are the experts when it comes to free transfers. They managed to snare Michael Ballack from Bayer Leverkusen in 2002, but were then on the receiving end four years later.
Jose Mourinho brought the goalscoring midfielder to Chelsea and he added a Premier League crown and three FA Cups to his well-stocked trophy cabinet while at Stamford Bridge.
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