Debt for a club in the top 10 turnover in world football is easily serviceable.
In the present top 10-11 clubs in the list,only Bayern Munich,PSG and City are debt free,one has a monstrous Commercial enterprise and a monopoly over a country and league and the other 2 are owned by oil rich human rights abusing dictator regimes in the ME.
Debt levels from google search of aforementioned clubs in the top turnovers list.
https://www.theguardian.com/football/2018/jun/06/premier-league-finances-club-guide-2016-17 for English debts.
Juve €229million.
United £482million (Net debt £212)
Chelsea Owe Abramovich £1 billion and rising.
RS £202 million. £72 million bank loan, £130million owed to FSG (i'm guessing main stand expansion loan) that's from The Guardian article above.
Spurs Reported last week to have 4 loans combined worth over £500 million that have to be paid within 5 years.
Arsenal £47 million.
Real Madrid €250 million.
Barcelona €247 million.
And any of these clubs do go under as we have seen there is always a sugar daddy to bail them out,FSG bought the RS for the price of the club debt and the richest man in the UK tried to buy Chelsea last month for £2 billion.
Look at AC Milan they got taken over by a Chinese fraudster with no money and now Paul Singer the vulture capitalist has taken over the club with his $39 billion worth of assets hedge fund,this is a guy who got a cool $5 billion cheque from Argentina for after he loaned them a couple of hundred million dollars during their cash crisis in the early 2000's,Billionaires today love football clubs and they all want one.