Dem Hames shirt salesThey won't, and can't, punish people for having debt.
What they could do is include the debt repayments in the ffp calculation which they don't do at the moment.
Even if they did that the impact on United, Madrid and Barca would be negligible. The debt repayment at United for instance is about 5% of turnover. I assume it is even less at the Spanish clubs.