Reportedly, he can choose between trying to make the roster of the Atlanta Hawks or the roster of the Minnesota Timberwolves.
In Atlanta's camp he'll begin camp behind (at least* and for all practical** purposes) Al Horford, Zaza Pachulia, and the $855,000 owed Randolph Morris.
*obligatory Joe Smith mention
**Al Horford and Zaza Pachulia can share the court. Al Horford and Zaza Pachulia and Josh Smith can't.
Minnesota, however, doesn't have a third center, arguably doesn't have a second center*, and their reserve power forwards (Darius Songaila, Brian Cardinal) have no intention of occupying the post.
*82games credits Oleksiy Pecherov with playing most of his minutes at center under the assumption that Javale McGee was the power forward during the 158 minutes (of Pecherov's 277 total minutes) they played together. In limited minutes, Pecherov has been a non-descript rebounder for a man of his height and a pronounced jump shooter.
In weighing his offers, Siler and his agent will surely weigh the relative lack of similar competition in Minnesota against the Hawks' recent penchant for filling the end of the bench with local guys. All things being equal, Siler would probably prefer to be a Hawk. Right now, things don't appear to be equal and I wouldn't be surprised if Siler takes his shot in Minnesota rather than Atlanta.