Hip strain could sideline Raiders’ Edwards for month

Photo: Connor Radnovich, The ChronicleDefensive end Mario Edwards Jr. could be out a month with a hip strain — and that’s the good news on the injury front for the Raiders.

Reserve tight end Gabe Holmes is likely headed for the season-ending injured reserve list after breaking a small bone in his foot and sustaining what coach Jack Del Rio called a “pretty significant high ankle sprain.”

Both players were injured in Friday’s preseason opener in Arizona.

Edwards was carted off the field in the first quarter, but the team survived a bigger scare.

“Mario is going to be out a few weeks,” Del Rio said Monday. “That’s unfortunate, but he will return and it’s not going to require surgery.”

Denico…