When Sam Allardyce arrived at Bolton they were in the bottom half of the second tier. Eight years later, he left the club as Premier League stalwarts with a couple of trips to Europe and a string of bloodied noses in their wake. After an ill-fated spell at Newcastle his career since then has been a patchwork of clubs who’ve hired Allardyce because they have to, not necessarily because they want to, and it hasn’t ended well at most of them. Including, of course, his one-game spell as England manager. 
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