"He felt better today than he did yesterday, but we won't know," Carroll said of Jackson. "We're not going to know for a while. We won't have him throw the football for a little bit and see what happens, but it is on his throwing shoulder."
Jackson was hurt during the third quarter on a designed quarterback run that went for 11 yards. Three Giants players landed on him at the end of the play.
"I thought that Tarvaris did well throughout with a couple of throws that he tried to jam in there, and I'm still mad at him for running and getting hit when he could have got down," Carroll said.
Carroll said Whitehurst, who led the Seahawks to three scoring drives during the fourth quarter and finished 11-of-19 passing for 149 yards and one touchdown, would take over as the starter in the interim.
"We got a really good performance from Charlie yesterday," Carroll said. "He did the things we needed to do to keep the game moving and then had enough there to finish it off and get the touchdown drive that we needed to win the football game, so we're really pleased about that."
Carroll was asked Monday if there was a quarterback controversy brewing after the way Whitehurst played.
"There is no controversy brewing here in this building," Carroll said. "You guys can have all the one you want."
The Associated Press contributed to this report.