FRISCO -- Cowboys All-Pro left tackle Tyron Smith is expected to miss his second consecutive game Sunday with a strained groin, although he has yet to be officially ruled out against the Eagles.

Smith didn't practice all week and is officially listed as questionable. Smith was at practice for the first time all week Friday and stretched with the team. However, Smith, who has also been plagued by back soreness all season, didn't participate in any individual or team drills. He just stood on the sideline and watched.

The Cowboys have prepped veteran Byron Bell all week to start at left tackle against the Eagles. Bell, who is from nearby Greenville, has taken all the first-team snaps in practice all week. Bell hasn't started a game since the end of the 2015 season for Tennessee. Bell suffered a dislocated ankle during an offseason practice in May 2016 and missed the entire season.

On Sunday at Atlanta, Bell replaced Chaz Green at left tackle after Green had allowed five sacks to Falcons defensive end Adrian Clayborn. The Cowboys plan to give Bell plenty of help Sunday against the Eagles with tight ends and running backs helping to man quarterback Dak Prescott's blindside.

The Cowboys almost never give Smith any help on the left side.