sorry if this got posted earlier, still trying to catch up. Here's ESPN's Dave Schoenfeld on who we could get for Lannan:
Blue Jays: Toronto currently has Brett Cecil, Henderson Alvarez and Dustin McGowan in its rotation. The Jays have an Eric Thames/Ben Francisco platoon in left. The Nats could go after Thames (a left-handed bat they could use) or maybe former top prospect Travis Snider.
Royals: Maybe the $5 million is too steep for the Royals, but let's face it: If they want to consider themselves sleeper playoff contenders this year, they need to upgrade the rotation. Jarrod Dyson is an all-speed, no-power center fielder who might be a slight upgrade over Roger Bernadina if he can get on base enough.
Tigers: Detroit might want to keep top prospect Jacob Turner in Triple-A, but it lacks a lefty in the rotation. Lannan for Delmon Young or Andy Dirks?
Red Sox: Boston could certainly use another arm, but not sure there's a good fit here.
Cubs: Marlon Byrd is a free agent after the season and would be a nice one-year fill-in for the Nats in center. Not sure Lannan is Theo Epstein's type of pitcher, however.
Dirks looks interesting. Don't know much about Dyson - looks almost like a Nyjer Morgan type player.