In the comments section about the World Series. It was from a chat with John Manuel of Baseball America from what I gathered.
Oh alright, thanks. I think I found the reference:
@Jaypers413 (IL): Any recent word on whether or not Rendon will get to see any action in the AFL?
John Manuel: Sounds like the Nationals expect to assign Rendon to the AFL sooner rather than later but wanted to make sure he was 100 percent.
http://www.baseballamerica.com/today/draft/news/2011/2612518.html