Dallas Cowboys guard Jonathan Cooper (64) walks off the field after warm ups before an NFL football game against the Kansas City Chiefs on Sunday, Nov. 5, 2017, in Arlington, Texas.
Dallas Cowboys guard Jonathan Cooper (64) walks off the field after warm ups before an NFL football game against the Kansas City Chiefs on Sunday, Nov. 5, 2017, in Arlington, Texas. AP Photo/Brandon Wade
Dallas Cowboys guard Jonathan Cooper (64) walks off the field after warm ups before an NFL football game against the Kansas City Chiefs on Sunday, Nov. 5, 2017, in Arlington, Texas. AP Photo/Brandon Wade
On the 49ers

On the 49ers

The latest Niners news with Chris Biderman

49ers sign guard Jonathan Cooper for offensive-line depth

March 20, 2018 01:55 PM