6. Billy Davies
Club: Derby County
Win percentage: 7.1%
After a wonderful first season at Derby that saw Billy Davies manage the club to a play-off victory, the Rams would return to the Premier League after a five-year absence. But the club – who barely made any new transfers – largely struggled in the top flight, and despite being such a popular figure he left by mutual consent in November 2007.
After just one win in 14 games, Davies left the Rams at the foot of the Premier League table after falling out with the board. Derby would go on to be relegated with just 11 points at the end of the campaign.