Polak should be our main Gk without a doubt, as he will be.
As for our sub GK, it makes absolutely no sense to buy a 25yo to sit on the bench and play in Coppa. Also, I highly doubt Perin would even consider such offer. It just destroys a career. And no, it's a huge BS if somebody says they should fight for a starting spot. It's totally different with GKs.
We should buy an oldie like when we had Storari or Abbiati.
So, shorly, no thanks. I'd rather take a cheap-ish senior GK who's reliable.