"It was pretty clear just in talking to the doctors ... it wasn't a hard decision," Frazier said, adding: "It's a little more extensive, but turf toe was a part of it. ... He just couldn't put any pressure on the foot and do the things he needed to do."
Jackson was 34-of-58 passing for 341 yards and three touchdowns with four interceptions in three games this season. He was playing because Brett Favre's NFL-record streak of 297 consecutive games started ended, due to a sprained throwing shoulder and numbness in his hand.
The Associated Press contributed to this report.