Former players pay tribute to Sir Alex Ferguson

Barcelona's Gerard Pique, Fiorentina's Giuseppe Rossi and Portland Timbers' Mikael Silvestre - all former Manchester United players - have paid tribute to Sir Alex Ferguson on Twitter:

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26 years, 13 league titles, 2 Champions Leagues, the Cup Winners' Cup, 5 FA Cups, 4 League Cups… Legend! http://t.co/33SRUiu0B3

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What a career! Proud and honored to have been coached by Sir Alex Ferguson. #thankyougaffer

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Today a major page of history for #MUFC I'm so grateful to have been managed by the Best Thank you Sir Alex #mufcfamily

Read: 'Football. Bloody hell': Ferguson's career in quotes

Read: The life and times of Sir Alex Ferguson

Video: Manchester United players seen at races after Sir Alex decision

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