Johnson is dealing with knee and ankle injuries, though he has been playing through both in recent weeks. He missed practice on Wednesday, returned to limited practice on Thursday and again missed practice on Friday. He should be able to play on Sunday.
Fantasy Impact: The Lions were likely giving Johnson some rest this week after he went off for 225 yards on Saturday night to break Jerry Rice's single-season record for receiving yards.
Johnson doesn't usually have much trouble against the Bears, so it's safe to say you can start him on Sunday as he sets his sights on 2,000 receiving yards.