To add to Stefan's reply to you, if we receive money from a sponsorship contract, that's revenue so goes into the Profit and Loss Account. We've received money (income) in consideration of an agreement to provide something, which in this case is publicity/advertising. In accounting terms, you debit the bank account (which is a balance sheet item) and credit the commercial revenue account (a P&L account item) with the cash received.
If we receive money from a loan, that's a balance sheet transaction. We've received an asset (cash) in return for accepting a liability to the lender. So in accounting terms we debit cash again but this time we credit a loan account. Both of these are on the balance sheet so the money received doesn't go into the P&L account (although any interest we pay will).
That, to me, shows the weakness of FFP as it stands. At the end of the day it's cash in the bank which you can spend the cash on players however it comes in, via a loan, sponsorship or the sale of a player. Obviously, if it's from the latter two, it's money that's been "earned" - money in, money out - whereas if that's a loan, it's not "earned" money and you've increased your liabilities. But FFP doesn't look at liabilities, just income and expenses. What UEFA should be doing is asking the likes of Chelsea and United how they would repay the debts they have (Chelsea's £1.4bn debt to Abramovich and United's now £650m debt to their lenders) if they needed to.
FFP, if it was seriously concerned with the fininacial sustainability of clubs, should be insisting that any debt is repayable over a given period, say 10 years for debt like United's or Chelsea's and maybe 20-25 years for infrastructure-related debt. Or else the notional repayment figure that would be required to settle that debt should be added to allowable FFP expenses. So if a club's notional debt repayment schedule under current interest rates would involve paying back £50m a year for a number of years, that £50m should be added to expenses for FFP purposes so the club can't spend that. That, to me, would level the playing field for clubs that don't have huge debts.