ticket availability for derby

Ciao,

I would like to come to see the derby Milan-Inter at San Siro on the 28th September.
Do you think it is still possible to find tickets on Saturday 27th for that derby?
How is it normally with these derbys, are the tickets sold out early?

Come sono venduti i biglietti normalmente per i derby? Si trovano ancora in sabato, un giorno prima della partita?