Jordan, who sat out the second half of Oakland's 35-17 win over Miami on Sept. 30, has been nursing a sore back since training camp and aggravated it early against the Dolphins.
The veteran running back walked off the practice field seemingly fine but wore an ice pack around his lower back in the Raiders' locker room afterward.
"He got some work early and felt it a little bit so he didn't finish," Oakland coach Lane Kiffin said.
If Jordan is unable to play, Oakland will rely on the combination of Justin Fargas and Dominic Rhodes. The two running backs split time with Oakland's first-team offense in practice Wednesday after Jordan left the workout and will likely do the same on Thursday while the team awaits word on Jordan. "It's still early," Kiffin said of Jordan. "Day be day he'll feel good, then all of a sudden he won't. It's real up and down."
Fargas had 172 of his career-high 179 rushing yards in the second half of the win over Miami, while Rhodes will be playing his first game for the Raiders after missing the first month of the season serving a four-game suspension.
"(Rhodes) is different so you can add some different dimensions to your offense," Kiffin said. "At the same time you don't want to do too much with him too fast. The guy hasn't played yet and so the last thing we want to do is put a bunch of stuff on him and try to do too much with him and he's not even right yet with just the basic stuff. So we'll take it slow in that way."