The Denver Broncos have placed coverage linebacker Mark Barron (hamstring) and defensive lineman DeMarcus Walker (calf) on injured reserve, according to the NFL's transaction wire.

Barron and Walker will be eligible to return after three weeks.

After placing wide receiver Courtland Sutton (knee) and defensive lineman Dre'Mont Jones (knee) on IR earlier this week, the Denver Broncos now have four open spots on the 53-man roster.

One of the open spots will go to quarterback Blake Bortles, who is expected to sign later this week after clearing COVID-19 testing. Another spot will likely go to practice squad outside...