Dallas Cowboys right guard Zack Martin exits with concussion

ARLINGTON, Texas -- The Dallas Cowboys lost another starter on their offense, as Pro Bowl right guard Zack Martin suffered a concussion with 5:07 left in the first quarter of a 38-10 loss to the Arizona Cardinals on Monday night.

He was ruled out as the second half began with the Cowboys trailing 21-3.

Martin spent a considerable amount of time in the blue tent with the medical staff. He headed to the locker room at the start of the second quarter.

The Cowboys were playing their first game without quarterback Dak Prescott, who suffered a compound fracture and dislocated right ankle in last week's win against the New York Giants. The Cowboys placed Prescott on injured reserve Monday, and he faces a recovery period of four to six months.

A once-vaunted offensive line is now gutted. Pro Bowl center Travis Frederick retired in the offseason. Pro Bowl left tackle Tyron Smith had season-ending neck surgery last week. Right tackle La'el Collins is on injured reserve because of hip surgery and has not played a down this season.

Joe Looney, who replaced Frederick, is on injured reserve with a knee injury but is expected to return. In the season opener, the Cowboys lost tight end Blake Jarwin to a torn ACL.

The Cowboys' current offensive line, from left to right is: Brandon Knight (undrafted free agent, 2019), Connor Williams (second-round pick, 2018), Tyler Biadasz (fourth round, 2020), Connor McGovern (third round, 2019) and Terence Steele (undrafted free agent, 2020). McGovern entered the game with two offensive snaps in his career.

The Cowboys scored a season-low three points in the first half.