Norwich have begun the search for a new manager after Johannes Hoff Thorup was relieved of his duties on Tuesday morning.
The Dane was appointed last May to replace David Wagner, who was sacked following the Canaries' Championship play-off semi-final defeat by Leeds.
Monday's 3-1 defeat at Millwall was a third straight loss for City, who have taken one point from their past five games and won only one of their past 10 matches, a run in which they claimed just six points to slip to 14th.
Only leaders Leeds have scored more than Norwich's 67 goals in 44 games this season, but their 66 goals conceded is worse than all but Sheffield Wednesday, Portsmouth and bottom two Cardiff and Plymouth.