Chicago Bears starting left tackle Jermon Bushrod and defensive tackle Jeremiah Ratliff will miss Sunday’s game at Carolina because of injuries.

Bushrod has a knee injury suffered in practice this week that kept him from practicing Wednesday and Thursday. He hasn’t missed a start as a Bear or since 2009 when he was with the New Orleans Saints.

Ratliff is still recovering from a concussion sustained in the Bears’ Week 2 win at San Francisco.

With Bushrod sidelined, Michael Ola is expected to move from left guard to Bushrod’s spot at left tackle and Matt Slauson will take over at left guard.

Slauson is returning from an ankle injury in the Bears’ season-opening loss to the Buffalo Bills. He practiced this week for the first time since he was injured.

“We’ve moved ’em around this week but the hope is that Matt’ll be playing and Mike will be at left tackle,” Bears coach Marc Trestman said.

Also expected back this week is defensive end Jared Allen, who missed last week’s game against Green Bay because of pneumonia and lost 15 pounds.

Meanwhile, wide receiver Brandon Marshall said an ankle injury that has lingered the past few games is improving.

Other Bears ruled out Sunday are safety Ahmad Dixon (hamstring) and linebacker Shea McClellin (hand).