The coach didn't get into specifics on Jackson's injury.
The 33-year-old receiver missed six games last season due to injury. 2015 marked the first season since 2010 (in which he held out 10 games in a contract dispute) that Jackson didn't break the 1,000-yard barrier.
First the veteran needs to get healthy.
Here are some other injury notes we are following Tuesday:
- Patriots receiver Julian Edelman threw down his helmet in disgust and had his left leg looked at by a trainer during practice. The wideout returned from the physically unable to perform list Sunday after having an offseason procedure to reinsert a screw in his left foot from a previous operation. NFL Media's Mike Garafolo reported tests on Edelman showed he did not suffer a setback in his return from foot surgery, according to two people informed of the results of the evaluations. Edelman's status going forward is day-to-day.
Defensive end Rob Ninkovich suffered a torn tricep, Rapoport reported. Ninkovich did not tear his tricep tendon, per Rapoport, just his tricep muscle. If all goes well, the DE could return by October.
- Eagles coach Doug Pederson said defensive ends Marcus Smith and Mike Martin, running back Wendell Smallwood, defensive back Malcolm Jenkins and offensive tackle Jason Peters won't play Thursday against the Buccaneers. Pederson added that Peters will warm up in uniform before the game, but nothing more.
- Tampa Bay Buccaneers coach Dirk Koetter said guard J.R. Sweezy saw a specialist in California concerning his back/calf injury, and there is no timetable for his return. Sources informed of the visit told NFL Media's Mike Garafolo that Sweezy received a positive report from the specialists and hopes to return soon.
- Indianapolis Colts defensive end Kendall Langford underwent arthroscopic knee surgery after being diagnosed with chondral defect of the knee and will be out three to four weeks, coach Chuck Pagano said. Center Ryan Kelly is returning Tuesday, while tackle Joe Reitz is day-to-day, Pagano added. Punter Pat McAfee is day-to-day with a knee injury.
- Seattle Seahawks running back Thomas Rawlshas been off the PUP list since Sunday, but he's taking it slow in practice. Rawls, expected to be the lead back in Seattle's running game, is returning from a broken ankle and ligament damage suffered last season. Coach Pete Carroll said "it's going to be a while" before Rawls is back at 100 percent.