Greenwood hasn't practiced since OTAs in May due to an abdominal tear and subsequent surgery.
"He's been working with our trainers," Schwartz said of Greenwood's progress over the last few months. "I would expect him to get back to practice (this week)."
The Lions like Greenwood's combination of size (6-1, 193) and speed, which is one of the reasons they took him in the fifth round of April's NFL Draft. But they need to see him on the practice field before they make any determination about how much they think he can help them moving forward.
"You have a certain window once you activate him, you have a couple weeks before you have to activate him to the 53," Schwartz said. "We'll just see what he looks like and how he's doing."
As soon as Greenwood starts practicing, the Lions have a 21-day window before he must be activated to the 53-man roster, or he would be ineligible to play for the rest of the year.
Either way, Greenwood said last week that he can be ready whenever his number is called.
"(The injury) gave me a little bit more time to get adjusted and get used to the terminology and stuff like that," he said. "Whatever they ask me to do I'm certainly going to give my all at."
The Lions finished Sunday's game in Philadelphia short two cornerbacks after injuries to
Schwartz said Monday that Lacey has to go through the NFL's concussion protocol before he can rejoin practice, which means he has to get clearance from an independent neurologist.
"So we'll just see how that goes, see how he bounces back from that and he'll be on the protocol to evaluate him," Schwartz said of Lacey.
Bentley has been dealing with the shoulder issue since early in the season and Schwartz said the team is still in "wait and see" mode with him.
Good thing for both of those players is that they'll have an extra day to recover since the Lions don't play until Monday night in Chicago.