SEATTLE -- Seahawks starting center Chris Spencer has an injured leg and will have more tests to determine how long he will be out.
Spencer hurt his left quadriceps muscle in the second quarter of Saturday night's 27-13 preseason win over Denver. He was taken to the locker room on a motorized cart.
Seahawks coach Jim Mora called the injury "the most serious" of assorted bumps and bruises. Mora said Spencer will have an MRI on Sunday.
Seattle is already without nine-time Pro Bowl left tackle Walter Jones on its jumbled offensive line.
The 35-year-old had his second knee surgery in eight months last week and is out indefinitely.
Usual right tackle Sean Locklear is replacing Jones. He allowed two sacks and had a false-start penalty Saturday.