If the Baltimore Ravens are going to mount a playoff run over the next two months, they will have to do it without one of their most valuable players.
Smith is under contract for $6.898 million next season.
The 2011 first-round draft pick had been playing at a Pro Bowl level this year after a breakout 2013 season. Per Pro Football Focus metrics, the 51.5 passer rating on throws in Smith's direction ranks as one of the five-best figures among NFL cornerbacks.
With Smith out of the lineup last week, Baltimore's secondary was exposed as overmatched against Ben Roethlisberger's white-hot aerial attack.
Smith's absence presents a stiff challenge for Harbaugh and his staff as they attempt to take advantage of an open race in the AFC North the rest of the way.