Jackson sprained his left knee in the first quarter Sunday against the Denver Broncos, but Baltimore coach John Harbaugh said the injury is not season-ending.
"It's a knee, but it's not a season-ending type of knee (injury)," Harbaugh said. "It's going to be a number of days to weeks. We'll see. We'll see if he can go back this week. If not, it will be sometime after that shortly."
Harbaugh said he will know more Monday or Wednesday when the results of further testing become available through the medical staff.
On the final play of the first quarter, Jackson took a 6-yard loss when he was sacked by Broncos linebacker Jonathon Cooper, moving Baltimore back to its own 27-yard line.