LSU is out of the college football poll for the first time since 2017 and is the first defending national champion to drop from the rankings in nine years.
No. 1 Clemson, No. 2 Alabama and No. 3 Georgia held steady at the top of the rankings Sunday, setting up a top-three matchup Saturday when the Crimson Tide hosts the Bulldogs.
Clemson received 59 first-place votes. Alabama got two and Georgia one. Notre Dame moved up to No. 4 and North Carolina is No. 5.
LSU dropped out from No. 17 after falling to 1-2 with a 45-41 loss at previously winless Missouri, who received two points in the poll. The Tigers had been ranked in 43 straight polls, dating to Nov. 5, 2017. That was the seventh-longest active streak in the nation.
The last defending national champion to be unranked was Auburn in 2011. Following Cam Newton's departure the Tigers spent much of the '11 season outside the Top 25, finishing 8-5 and unranked.
This is the second straight week that one of college football's traditional powers has fallen from the rankings, with LSU following Oklahoma.
The Sooners remained unranked Sunday, even after beating Texas in four overtimes.