The problem is that Milan isn't even looking for one, Jashiri isn't it and neither is Xhaka. Ricci is perfect for Allegri-ball, a more defensive minded Locatelli, imo.
I would have looked for a profile like Depaul or even Rabiot that are more offensive but with what we got now I can't see where our goals are coming from. Need an in top form Gimenez and outstanding seasons from both Leao and Pulisic.
I don't think Allegri will be deploying a dedicated creative mid.
For the last few years, we have been using a double pivot midfield where an attacking midfielder (usually more of a second striker under Pioli [Brahim, CDK, RLC]; Fonseca [Pulisic], and Conceicao [Felix--until 343]) having this sort of shape:
LW--ST--RW
------SS
---CM--CM
Allegri, from reports (and targets seem to align with this) is going to setup with a 433, with our midfield having a more V shape. It looks like he wants a DM at the base of the midfield (I think that's Ricci [it was supposed to be Xhaka]) and then you have Modric, Fofana, RLC, Jashari, to rotate in those two spots, with Jashari being able to play that base midfielder if needed.
LW--ST--RW
-CM----CM
-----DM
Jashari, from what I'm gathering, seems to be pretty versatile. I think he can play DM, but he's more of a box-to-box all-rounder, who has an eye for the pass.