6. Tony Adams, Portsmouth
Another common cliche in football management is the case of great players making terrible bosses, as also shown by the already mentioned Shearer and also Graeme Souness, among others.
Adams had been assistant to Redknapp when Portsmouth won the FA Cup in 2008 and took the reigns permanently the next season, only to be sacked after 16 matches and just 10 points picked up.
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