Just looking at the Juventus FC SpA financials, we have a current ratio (current assets/current liabilities) of 0.38. A current value below 1 means that there might be some short-term liquidity issues, meaning that if the debts came due today we could be in trouble. The quick ratio is rather low as well, which isn't surprising. All the other financial ratios are rather poor as well, and if we weren't a football club, I would be very worried.
But we are a football club after all, so of course we have a lot of leverage and debt since we don't have free access to capital from a single wealthy owner. Nobody invests in football clubs because the expected return is so low, which is why our stock price is trading for cents. Debt has increased year-over-year for several years, but so have the value of our assets, so that at least is a good sign.
I think the author of the article (or the article he mentioned) probably used only financial ratios to come up with the 75% conclusion, which are not always accurate unless some context is placed on them. Especially for football clubs. I would only be worried if we continue to fail in the Champions League and somehow lose half of our stadium-going fans.
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And this is why I have concerns over Marotta's transfer policy of structured deals with loans and options to buy since he is essentially using expected cash flows based on future performance to fund deals on skeptical players. But these expected cash flows aren't based on any tangible discount rate, only that we hope to increase revenue through more sales of tickets and TV rights and Champions League funding. But none of that is guaranteed by any means.