Sadly I don't have a save file from before it happened.
However since that last save of mine became unplayable, I started a new save. This time Ajax. My finances are great, almost 200million pounds and I had a transfer budget of 80 million or so but once I qualified for the CL, my budget went into negative again. This time only 13 million negative, though. What is going on? And sadly I don't have a save file from before it happened either. If it happens again I'll make sure I have a save file.