LAKE FOREST, Ill. -- Chicago Bears coach Marc Trestman wants to wait a couple more days before making a decision about whether to keep Marquess Wilson on the active roster.

With the receiver expected to miss the next month, the Bears can free up a spot on the active roster Tuesday at 3 p.m. by placing Wilson on the injured reserve with a designation to return.

“I think I could better answer that after Wednesday’s practice, and it’s simply because there’s a lot of technical CBA rules involved in this thing,” Trestman said. “I think that to bring clarity to it, I’d rather give you that answer as we move through the week.”

If the Bears decide to place Wilson on the injured reserve with a designation to return, he won’t be able to participate in practice until Week 7 and won’t be eligible to play until Nov. 9, when the team travels to Green Bay coming off its bye week.

If Wilson remains on the active roster, he’ll continue to occupy a spot the team could use to bolster another position. But the positive side of that is Wilson could return to action as soon as he recovers instead of waiting until Week 7 just to be eligible to practice.

Every team is allowed to use the IR with designation to return only once per year. The Bears used their short-term IR designation last season on Charles Tillman after he suffered a triceps injury during a November loss to the Detroit Lions.

The team might opt to use the short-term designation on Wilson given the presence of veteran receiver Santonio Holmes, who is now expected to take on the No. 3 role. Now that the Bears are in game-planning mode, the playbook will be narrowed significantly for the Week 1 matchup against Buffalo, which would give Holmes a better opportunity to fully absorb the aspects of the system the team will utilize against the Bills.

“At this point, there’s no comfort level [in the offense],” Holmes said. “Still learning the system, working my way into one of the core guys for this team, and I still have a lot to learn. [I’m] spending a lot of time with Coach [Mike] Groh learning the offense, going over plays, formation, personnel and things like that on a daily basis to keep me caught up with the team.”