I think he would be good here. Personally, if we can get him for a good price (not 16m, which is laughable) I would prefer him as a backup to both wings. Since he excels on the left but is right footed he could do well on the right side as well to give Krasic a rest. That way we can pass on Pepe and have quality coming off the bench.
Maybe in a 4231 he could be on the left of a 3. What about this?
Buffon
Beck-Bonucci-Chiellini-Ziegler
Pirlo-Inler
Krasic-Pastore-Perotti
Matri