WATCH: Mississippi State's K.J. Costello discusses his record-breaking day against LSU

Costello set the SEC's new single-game passing yardage record

Mississippi State quarterback K.J. Costello couldn't have announced his presence in the Southeastern Conference with any more authority. The graduate transfer from Stanford played his first-ever SEC game on Saturday and all he did was set the league's new single-game passing yardage record with 623 yards through the air as he helped lead the Bulldogs to a 44-34 upset over defending national champion LSU. Watch above for all Costello had to say following his record-breaking performance.

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