The number of PL castoffs doing well in Italy is staggering, and it's not just the difference in quality of the league either, as Italian teams are generally doing quite well in Europe lately as well.
Aside from the couple you've mentioned, all of Darmian, Lukaku, Mkhi, Giroud, Loftus-Cheek, Tomori, Pulisic, Smalling, Abraham, Anguissa, Kolasinac, Zappacosta have had at least good spells over there, and all of them were unwanted by their clubs or relegated from the PL. There might be even more.