The second-year running back has been dealing with a nagging groin injury that has kept him out of several training camp practices.
Heading into his second NFL season, the ex-Georgia Bulldogs running back is seeking to establish himself as one of Detroit's reliable offensive weapons.
On a team that does not feature a significant amount of true playmakers, losing Swift for any amount of time would greatly hinder the Lions' offense.
Following Detroit's 16-15 loss to the Bills, Lions head coach Dan Campbell explained the reasoning behind Swift sitting out the opener.
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"Swift right now, look, we're just being conservative with Swift," he said. "He's kind of had a little bit of a groin. I chose to just, ‘Let's sit him. Let's sit him, and let’s rehab him and strengthen him a little bit.’ He was fighting through it. He was doing a good job, but it just didn’t feel like it was getting better fast enough. So, let's just sit him. He could have gone if we really, really needed it, but it's not worth it right now."
As a rookie, Swift led the Lions with 10 touchdowns, and finished with 521 yards rushing.
Lions training camp resumes with an open practice Monday afternoon and a practice Tuesday evening that is open to season- ticket holders only.
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