He's on a one year deal with a mutual option for 2020 and a $500,000 buyout. He can't be sent down but I doubt the Royals want to keep him for 5.75 million next year. They'll likely be willing to ship him out for pretty cheap.
It seems like he's fallen out of favor in Cincinnati. Maybe it'd be a Tommy Pham Cardinals situation where we could get him for cheap. My concern is I think I read a few weeks ago that he raised a huge stink because he only wanted to pitch in 3 out save situations. I don't think that mentality would fit into our bullpen too well considering Rocco loves to mix and match. I wouldn't give up anything significant for him.