Posted by ESPN.com's Mike Sando
The Rams and Frerotte were close to a deal that would have made Frerotte the second quarterback for ongoing minicamp practices. Frerotte reportedly backed out because he was afraid the Rams might draft a quarterback. Boller's addition addresses the position for St. Louis heading into the draft.
The Rams' depth chart at quarterback now includes Marc Bulger, Boller, Brock Berlin and Jeff Otis. Boller has started 42 NFL games, all with the Ravens. He spent last season on injured reserve with a shoulder injury. If healthy, Boller should serve as a viable backup. He is also relatively young -- 27 -- so he has more upside than the 37-year-old Frerotte.