The Rams did not exercise center John Sullivan’s 2019 option, sources tell Tom Pelissero of NFL.com (on Twitter). The news comes as a surprise since Sullivan has not missed a start in the past two seasons and is one of the league’s most respected centers. 
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Sullivan, 34 in August, graded out as the tenth-best center in the NFL in his first season with the Rams, according to Pro Football Focus. In 2018, Sullivan slipped all the way down to No. 31 with a career-low 52.7 mark. The Rams, apparently, agree with the advanced metrics, which indicate that the veteran’s pass blocking and run blocking have both declined.
Without Sullivan and his veteran guidance, the Rams will likely be in the market for a center. By letting Sullivan walk, the Rams will avoid a $6.25MM cap charge for the lineman, according to Over The Cap.
Bradbery at 31