Manchester United are the club furthest into the
red (£605m), with
Arsenal next up on £268m.
With
Portsmouth having admitted on Sunday that they would seriously consider any viable bid for the club, it would appear that the bubble may be about to burst in English football.
Hull are a rare exception to the rule, in that they operate debt-free, but Duffen has expressed his concern for some of the Tigers' rivals.
"We have had to be careful," he said.
"We're not as rich as Croesus as some of our competitors are, but in some ways we're maybe one of the wealthiest clubs as we don't have any debt.
"A lot of the clubs have themselves highly geared and in these uncertain banking times I think there could be a few casualties in the Premier League later in the season sadly."
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