I've been having some fun this year using a midfield composed of huge physical players and Chiellini fits right in. I put a shadow on him and let him be box-to-box alongside baby Gullit (Maxim Gullit of course). He's a huge physical presence in midfield, has pretty good responsiveness for a big player, and can shoot quite well with both feet. Overall, can't beat the value for 20K whether you use him in your main team or as a sub.
Doesn't get back as much as I'd like without tactics