LSU became the first defending national champion to lose its season opener in more than two decades Saturday, and coach Ed Orgeron said the responsibility rests with him to turn things around heading into this weekend's game against Vanderbilt.

The Tigers, who entered Saturday's game ranked sixth in the country, lost at home to unranked Mississippi State, 44-34.

"It's my job to fix it," Orgeron told reporters on Monday. "I guarantee you this week we're going to start fixing it."

Orgeron said the coaching staff should have come up with a better plan on both sides of the ball. His defense, which he said previously could be better than last year's, allowed Mississippi State quarterback K.J. Costello an SEC-record 623 yards passing. Orgeron said the Tigers allowed a whopping 383 yards after the catch.