The Atlanta Journal Constitution reported that Jones was put on a backboard with his neck immobilized. He was carted off the practice field and put in an ambulance. The extent of the injury was not immediately known.
Jones was motionless and had his eyes closed as he exited, according to ESPN.com
"We certainly hope Terren is going to be all right," coach Mike Smith said. "We don't have any update right now. But as soon as we do, we'll release that information. Any time a player doesn't leave the field on his own power, you're always concerned about it."
The 22-year-old out of Alabama State joined the team as an undrafted free agent in 2013. He spent most of last season on the practice squad.
Also during practice, rookie defensive lineman Ra'Shede Hageman exited the field and did not return with what is believed to be a hairline fracture in his wrist, according ESPN. Hageman threw a punch at center Joe Hawley during pass rush drills and received medical attention immediately after the scuffle.
---The San Francisco 49ers claimed wire receiver L'Damian Washington off waivers from the Dallas Cowboys and waived wide receiver Jon Baldwin.
The 6-foot-4, 200-pound Washington was waived by the Cowboys on Saturday after signing with the club as a free agent.
Baldwin was acquired in a trade from the Kansas City Chiefs last August.
---The Indianapolis Colts signed free agent wide receiver Nu'Keese Richardson, waived-injured cornerback Brandon Burton and waived wide receiver Greg Moore. If Burton clears waivers, he will revert to the Colts injured reserve list.
While playing for the University of Tennessee, Richardson and two teammates were arrested for armed robbery in November 2009 after they tried to rob a gas station in Knoxville. Richardson was booted from the team and eventually pleaded guilty to the charges, getting probation but avoiding jail time.
--- Rock star Jon Bon Jovi wrote a letter that was published in the Buffalo News that states his commitment to keeping the Bills in western New York if his bid to buy the team is successful.
The letter, titled "Why We're Bidding on the Buffalo Bills," marks the first time Bon Jovi has publicly made known his intention to buy the team.
"If we are given the chance to be the next owners of the Buffalo Bills, I promise you that we will bring the same passion that you do every Sunday, every day," Bon Jovi wrote.
The Bills were put on sale after owner Ralph Wilson died in March.
---Arizona Cardinals outside linebacker John Abraham apologized for his DUI arrest outside of Atlanta that occurred in June. Abraham has not yet reported to training camp.
"First, I want to apologize to my family and friends, the Cardinals organization, my teammates and the fans for letting them down," Abraham said in a statement. "I understand the significance of my actions and right now I am taking the necessary steps to handle my personal business. I am very thankful for the support from my family, friends and especially the Cardinals organization during this time in my life. I am looking forward to being back with my teammates in the near future."
Coach Bruce Arians said Abraham was excused from camp for personal reasons.
---The Arizona Cardinals picked up linebacker Trevardo Williams off waivers Saturday and cut cornerback Todd Washington. Williams was waived by the Houston Texans on Friday.
Williams was a fourth-round draft pick of the Texas in 2013 and spent the season on injured reserve with a knee injury.
---The Tampa Bay Buccaneers activated defensive end Ronald Talley from the active/non-football injury list. The Bucs signed Talley in June.
---The New England Patriots re-signed rookie linebacker James Morris. He was originally signed by the Patriots on May 16 as a rookie free agent out of Iowa. He was then released on May 20.