Entering the fourth and final year of the deal he signed as a rookie, the 24-year-old Jackson is due to earn roughly $565,000 in base salary this season.
The Eagles reported to camp on Wednesday, but because of the quick restart after the NFL lockout, players were given until Thursday to report before facing any penalties.
Jackson could be fined $30,000 for every day of camp he misses, although the team has not commented on any disciplinary action.
He has not worked with the team since the Eagles' season ended in January. With Jeremy Maclin also out of training camp because of an illness, the Eagles have been missing their top two wide receivers.
A Super Bowl vet's take
The Eagles may have assembled a "dream team" roster - in the words of Vince Young - but few players on the team know what it's like to actually win a Super Bowl.
Defensive tackle Cullen Jenkins does. The former Packer, who won a championship in February and is now a member of the Eagles' star-studded free-agent class, arrived at Lehigh on Sunday with a warning: It's not easy being a favorite.
"I explained to the people I've talked to so far: Last year in Green Bay, early in the season, a lot of people were picking us to do well, but we didn't have the success right away because I think it was expected a little bit," Jenkins said.
The Packers were 3-3 to start the season and squeaked into the playoffs before going on their Super Bowl run.
"We weren't quite there yet as a team until we got our backs up against the wall," Jenkins said. "And once you get your back up against the wall and you have to do it, there was no more worrying about how good we were. . . .
"Regardless of how much talent this team has, we have to have that mind-set that we have to go out and fight for our lives every game."
Jenkins, who had seven sacks in 11 games last season, has played both defensive end and tackle, and will likely play tackle in the Eagles' 4-3 alignment. He admitted he didn't draw as much free-agent interest as he thought he would, but he was attracted to the Eagles by their big moves.
"The team is trying to do everything in their power to be the best team they can be," Jenkins said. "You're coming into a situation where failure is not an option. They're expecting to win."
There were several injuries on the first day of hitting, but none was deemed serious, a team spokesman said. The injury list included cornerback Dominique Rodgers-Cromartie (Achilles), tight end Brent Celek (back), running back Dion Lewis (hamstring), defensive end Victor Abiamiri (calf), defensive end Juqua Parker (dehydration), defensive tackle Antonio Dixon (cramps) and defensive end Darryl Tapp (cramps). . . . The Eagles signed former Villanova linebacker Terence Thomas, an undrafted rookie free agent.