"It's nothing major," Knox said. "Just some bumps and bruises, but we'll just take it day by day, and I can't wait to get back out here with the guys."
Knox originally hurt his back during Thursday night's practice while running a pass pattern down the field.
"I kind of felt it lock up a bit," Knox said.
The Bears are taking a cautious approach with the receiver, who led the team with 960 receiving yards last season and finished tied for the team lead in receptions (51) and touchdown catches (five).
He reported to camp stronger than in previous years, after Knox spent the lockout adding muscle to his upper body.
The last thing the third-year wideout wants to do now is return to action too quickly and suffer another injury.
"Preseason counts, but I'd rather wait to the regular season when it really counts," Knox said. "[I'm hoping to get back out there] as soon as possible. [Bears head athletic trainer] Tim [Bream] hasn't told me anything as of right now, I'm just going to go by what he says."
Meanwhile, rookie linebacker J.T. Thomas remained sidelined with a hip injury.
"It's nothing serious [with Thomas]," Bears coach Lovie Smith said. "He should be back in a couple of days."
Jeff Dickerson covers the Bears for ESPNChicago.com and ESPN 1000.