If we use Trezeguet to land Sissoko, I'll personally fly over to Turin and beat the shit out of Secco myself. Sissoko looks like a good young player, but if we swapped him with Trez, we should get lots of cash with that also.
Other teams are interested in Camoranesi and Trezeguet and we can land more important players, such as world class centre backs and good money to buy great replacements for Trezeguet.
As for Gerrard, with the money we'll have to spend on him, it would be wiser to go for others who could still make us great, and use the cash to strengthen all other positions which are required.
Instead of Gerrard, go for Ribery and Diarra...they would cost the same as Gerrard and fix two positions in midfield.