4. Michael Ballack
After clashing with Bayern Munich hierarchy, German star Ballack became available in summer 2006 and was wanted by Manchester United boss Sir Alex Ferguson. But just as it seemed United would land Ballack, the midfielder moved to Stamford Bridge.
Ballack said he wanted to stay at Chelsea for life but the former Bayer Leverkusen star remained for just four seasons winning the Premier League and three FA Cups.
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