(CBS) The Bears made four roster moves on Tuesday afternoon, the most significant being the signing of guard/tackle Eben Britton to provide depth on the offensive line after starting guard Matt Slauson and center Roberto Garza suffered ankle injuries in Week 1 that reportedly could keep them out up to several weeks.

In a corresponding move, Chicago terminated the contract of receiver/kick returner Micheal Spurlock to make room for Britton on the 53-man roster. The Bears also signed receiver Greg Herd to the practice squad and released defensive tackle Roy Philon from the practice squad.

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The 6-foot-6, 308-pound Britton, 26, spent training camp with the Bears before being one of their final cuts. He also spent last season with Chicago, playing in 13 games and filling the role as the sixth lineman in jumbo sets. He’s primarily a guard and tackle.

Brian de la Puente filled in at center for Garza in Sunday’s loss to the Bills, while Michael Ola replaced Slauson. Both graded out well, according to Pro Football Focus, so while the Bears are lacking depth, the offensive line still held its own.

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Spurlock played a role for Chicago in Sunday’s loss to Buffalo, making one catch and acting as the punt returner, though he only made a fair catch. But his ticket out of town was written when the injuries on the offensive line forced the Bears’ hand.

A product of Eastern Washington, Herd entered the NFL in 2013 as an undrafted free agent with the Dallas Cowboys.

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Philon had been on the Bears’ practice squad since last week.