I would rather opt for the trident:
Mellberg Legro Chiellini DC
Zanetti Marchisio Sissoko
Amauri Trezequet/Iaquinta DP
And let me explain the reasons behind this formation.
Mellberg; Grygera is not in a good form, he needs to be benched and Mellberg has proved he can do fairly good there, atm
Legro; will feel a lot more comfortable between Mellberg and Chiellini, he will be reborn again...
Chiellini; has to return asap, Cagliari would be a nice warm up game!
De Ceglie; Needs more playing time, esp against the inferior teams, his presence in my scheme has a dual role, his lungs and skills will allow him to make runs and reach for DP, Neddy is unable to offer more atm anyway...
We need to drop Marchionni and Neddy, they hit the bottom, they need some time to find themselves. Against Cagliari we can afford to use the trident, esp since all of our forward line is available. If not know when?? Its supposed to be an overkill for Cagliari and that would boost our confidence a great deal!
So Sissoko and Zanetti will dominate the midfield and cover up the spaces between our raising fullbacks! Whilst Marchisio will do what he does best, he will link our midfield with out forward line, balancing our game and able to defend if the other DMs are drifted to the sides!
Amauri is still very useful, despite he didnt quite scored a lot recently. He can still be very creative and in many games he tends to draw back and work as a right winger/SS. In this scheme, he wont have to worry much about scoring anyway, just to do what he does best and let the exp finishers to their job.
DP is essential to our cause, we tried without him and we failed, he has to be there! At 75' he may be replaced by Giovinco...
As for the CF position;
If Treze is ready, he should start and then replaced by Iaq, even at the HT. They both are more efficient that way (Treze starting and Iaq coming in as a sub)
If Treze is far from ready, then Iaq should start at be used as CF, instead of Amauri, for the known reasons.
Although CR will be probably scared to try such an offensive scheme, right after a negative result,
but i am certain that he will try that soon or later!
I think it is the best possible moment to do so.
We need a convincing victory, Cagliari in our home seems to be an easy victim.
A team we could try a few new things. We are in a winger crisis. Their performance is just horrible, Camo is not there to change that and our owners have decided that Giovinco's future would be to replace DP's position.
So we may drop them and use the abundance of CMs and forwards to our favor.
When we were signing so many strikers, CR has been always hinting for the possibility of the trident, it is a perfect opportunity to test that weapon, we have been denied for the first part of the season. Our best weapon is still unused.
If it works, our chances for the title and CL advancement, will be increased!