Walker struggled in relief in Week 12 against the Broncos after starter Dorian Thompson-Robinson left the 29-12 loss early due to a concussion. Thompson-Robinson remains in concussion protocol, and even if he isn't cleared in time to play Sunday against the Rams, Flacco would get the start, with Walker backing up the 38-year-old. Flacco will presumably be elevated from the practice squad prior to Sunday, regardless of Thompson-Robinson's status.
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