Brian Kelly entered Sunday’s season opener against No. 8 Florida State as confident as a coach could be. 

He left Orlando, Florida, questioning what kind of football team he has in LSU after a 45-24 loss to the Seminoles.

Brian Kelly talks to Jayden Daniels

LSU Tigers head coach Brian Kelly talks with Jayden Daniels, #5, during a timeout in the first quarter against the Florida State Seminoles at Camping World Stadium on Sept. 3, 2023 in Orlando, Florida. (Julio Aguilar/Getty Images)

"Congratulations to Florida State. They played a great second half," Kelly said in his postgame press conference. "They were the better football team tonight. We certainly are not the football team that I thought we were." 

UCLA'S CHIP KELLY TAKES DIG AT NCAA OVER NEW CLOCK RULE: 'HOPE YOU GUYS ARE SELLING A LOT OF COMMERCIALS'

"I take full responsibility for not having our team playing the type of football I thought they would," he continued. "And our players have to make a decision that, ya know, they have to get back to the practice field and double down on their efforts and their attention to details and their focus, and the things they need to do as well. But this is a total failure from a coaching standpoint and a player standpoint that we have to obviously address and we have to own. 

"I know adversity is always going to strike at some time in this game, and this is our first real piece of adversity that we have to address. I'm confident our guys and our coaches will rally in the manner that they need to."

The Tigers entered Sunday’s game as the No. 5 team in the country after winning a surprising 10 games in Kelly’s first season as head coach in Baton Rouge. 

Brian Kelly against Florida State

LSU Tigers head coach Brian Kelly during the Camping World kickoff football game between the Florida State Seminoles and the Louisiana State University Tigers on Sept. 3, 2023 at Camping World Stadium in Orlando Florida. (Joe Petro/Icon Sportswire via Getty Images)

On Thursday, Kelly made a bold claim on "The Brian Kelly Show" as his team prepared to kick off its 2023 season. 

CLICK HERE FOR MORE SPORTS COVERAGE ON FOXNEWS.COM

"I think we’re in a really good position in year two," Kelly said. "Look, I will say that there are still some areas that need to be improved. We’re going to take 15 freshmen on this trip and 14 transfers. Nearly 40% of this travel roster are going to go overnight for the first time with LSU.

"And that’s not a disclaimer of any kind. We’re going to go beat the heck out of Florida State."

LSU wound up being on the wrong end of a big loss, allowing Florida State to score 31 unanswered points after taking a 17-14 lead into halftime. 

Jordan Travis passes against LSU

Florida State Seminoles quarterback Jordan Travis, #13, passes the ball during a college football game against the LSU Tigers on Sept. 3, 2023 at Camping World Stadium in Orlando, Florida. (Joe Robbins/Icon Sportswire via Getty Images)

"I’m quite aware of the score and I didn’t like the way we came out. I sensed it. I felt it. And I have to take accountability and responsibility for the way we came out in the second half. It’s disappointing, but the buck stops with me," Kelly said. "And I have to get our football team to understand and recognize you have to play this game for four quarters with a mentality. 

CLICK HERE TO GET THE FOX NEWS APP

"For some reason, we thought we were somebody else. We thought we were the two-time national champion Georgia Bulldogs, or something. I don't know what we thought. But we were mistaken."

In the most anticipated matchup of Week 1, Florida State quarterback Jordan Travis threw for 342 yards and four touchdowns, including three to wide receiver Keon Coleman. 

Florida State is now on a seven-game winning streak dating back to last season after winning its final six games of the 2022 season.