They aren't in some huge minus as it may seem at first glance. They sold players for some 35m euro (Gilardino, Oliveira, Grimi, Simic, co-ownerships and loans) and they bought players for 38m+Shevchenko (so, around 45-48m).
That's a "small" difference of 10-13m euro.
Wages wise they have to...