Whitehurst's stint didn't last long, however, as Jackson entered the game with 10:41 left in the second quarter and the team already down 10-3 against the Cincinnati Bengals. The Seahawks lost 34-12 with Jackson ultimately carrying most of the load, finishing 21 of 40 for 323 yards and an interception. Whitehurst tallied 52 yards and was 4 of 7 passing.
Jackson was active after missing last week versus Cleveland with a chest pectoral injury. Whitehurst struggled in his place against the Browns, completing just 12 of 30 passes for 97 yards and an interception. The Seahawks lost 6-3.
Following Sunday's game, Carroll explained that he had been looking to give Jackson an extra week of rest.
"I was hoping for another week," Carroll said. "As you could see, (Jackson) could throw the ball well enough to play, he could play, but he could have used another week. So in my mind I knew we could play. I was going to see if Charlie could pull it together and get something going for us."
Jackson said he was ready to play, regardless of whether he started or not.
"Woke up this morning with the mindset to come here expecting to play," Jackson said. "I really didn't know how I was going to feel, but it felt good enough to play so I just left it up to the coaches, and they went to Charlie first to see how it goes and we'd just go from there."
Bengals tight end Jermaine Gresham, who was listed as probable on the final injury report, has a hamstring injury and is unable to go. He's one of two starters out for Cincinnati with starting middle linebacker Rey Maualuga already ruled out with an ankle injury.
Seahawks wide receiver Mike Williams was a surprise inactive.
Carroll said a tweaked hamstring kept Williams on the sidelines. Williams was a full participant in practice all week and wasn't listed on any injury report. Seattle is also thin in the secondary, with defensive backs Jeron Johnson, Kennard Cox and Ron Parker all inactive.
Information from The Associated Press contributed to this report.