The Canaries dropped to 17th in November after a 3-1 home defeat by Blackburn but a fine second half to the season saw them win eight straight home games to earn a play-off spot.
They drew 0-0 with Leeds at Carrow Road in the first leg on Sunday but a dire performance saw the Whites cruise to the play-off final, where they will play Southampton or West Brom.
Wagner, who led Huddersfield to promotion to the Premier League in 2017, was appointed in January 2023, replacing Dean Smith, and eventually finished 13th in the Championship last season.
He failed to reference Knapper during a post-game press conference following the final day 1-0 defeat at Birmingham, despite praising his predecessor Webber for his support.
More to follow.