David Montgomery and Tyrion Arnold were credited as full participants

Lions running back David Montgomery (knee) participated fully in the round on Tuesday as he attempts to return from an injury that was initially expected to end his season.

He has missed the last three games but did not require surgery and the Lions did not place him on injured reserve.

Montgomery is expected to play Saturday night.

“It will mean a lotCampbell said, via Eric Schlitt of Prideofdetroit.com. “He’s a big part of us. He’s a big part of us, and to me, he’s a bell cow. He’s a tone-setter. He’s a motivator. So, there’s a place for him. There’s a place for him here, so there’s going to be a place for him in this game. So, it’ll be good “Get it back.”

Montgomery scored 12 rushing touchdowns and had 775 receiving yards. He also caught 36 passes for 341 yards in the regular season.

Cornerback Terrion Arnold (foot) is also listed as a full participant. His injury looked worse than it did when he was taken off the field in Week 18. He has a bruise on his foot that won’t keep him off the field.

In 16 games as a starter, Arnold recorded 60 total tackles with 10 passes defended and one fumble recovery. He was on the field for 91 percent of the defensive snaps in the games he played.

Right guard Kevin Zeitler (hamstring), defensive lineman Pat O’Connor (calf) and cornerback Ennis Rackstraw (hamstring/illness) did not practice.

Zeitler and O’Connor were injured in the Week 18 game against the Vikings.

Rakestraw is two weeks into his 21-day practice window as he seeks to return from injured reserve.