Kellen Clemens provides experienced depth behind Philip Rivers, and he had a 4-5 record with the Rams in 2013 as a starter. According to ESPN.com, his fourth-quarter comeback ability has made him a coveted backup over the last few years.
Rivers is durable. As in he's started every single regular-season game for the Chargers since 2006, so Clemens' chances will be limited.
Clemens is not necessarily the guy you want to be counting on, but if Rivers owners find themselves in a pinch, Clemens will be waiting patiently on your waiver wire.