Marshall joined the Canaries from Wolves in June 2018 and he made six appearances in all competitions last season.
The 28-year-old full-back or winger, who had previously played for Leicester and Blackburn, spent the second half of last season on loan at Millwall.
"Everyone at Norwich City wishes Ben all the best for the future," the club said on their official website.
Restore Data
| Team | P | W | D | L | F | A | GD | PTS | |
| 1 | Leeds UnitedLeeds | 29 | 17 | 9 | 3 | 53 | 19 | 34 | 60 |
| 2 | Sheffield UnitedSheff Utd | 29 | 18 | 6 | 5 | 40 | 21 | 19 | 58 |
| 3 | Burnley | 29 | 15 | 12 | 2 | 36 | 9 | 27 | 57 |
| 4 | Sunderland | 29 | 15 | 10 | 4 | 42 | 24 | 18 | 55 |
| 5 | West Bromwich AlbionWest Brom | 29 | 10 | 14 | 5 | 38 | 25 | 13 | 44 |
| 6 | Middlesbrough | 29 | 12 | 8 | 9 | 47 | 36 | 11 | 44 |
| 7 | Blackburn RoversBlackburn | 29 | 12 | 6 | 11 | 32 | 28 | 4 | 42 |
| 8 | Bristol City | 29 | 10 | 11 | 8 | 37 | 34 | 3 | 41 |
| 9 | Watford | 29 | 12 | 5 | 12 | 40 | 41 | -1 | 41 |
| 10 | Sheffield WednesdaySheff Weds | 29 | 11 | 8 | 10 | 42 | 45 | -3 | 41 |
| 11 | Norwich CityNorwich | 29 | 10 | 9 | 10 | 48 | 42 | 6 | 39 |
| 12 | Coventry CityCoventry | 29 | 10 | 8 | 11 | 39 | 38 | 1 | 38 |
| 13 | Queens Park RangersQPR | 29 | 9 | 11 | 9 | 32 | 37 | -5 | 38 |
| 14 | Millwall | 29 | 9 | 10 | 10 | 28 | 26 | 2 | 37 |
| 15 | Preston North EndPreston | 29 | 8 | 13 | 8 | 32 | 36 | -4 | 37 |
| 16 | Oxford UnitedOxford Utd | 29 | 9 | 9 | 11 | 33 | 43 | -10 | 36 |
| 17 | Swansea CitySwansea | 29 | 9 | 7 | 13 | 32 | 40 | -8 | 34 |
| 18 | Cardiff CityCardiff | 29 | 7 | 10 | 12 | 33 | 44 | -11 | 31 |
| 19 | Hull City | 29 | 7 | 8 | 14 | 30 | 38 | -8 | 29 |
| 20 | Stoke CityStoke | 29 | 6 | 11 | 12 | 26 | 36 | -10 | 29 |
| 21 | Portsmouth | 29 | 7 | 8 | 14 | 36 | 52 | -16 | 29 |
| 22 | Derby CountyDerby | 29 | 7 | 6 | 16 | 32 | 40 | -8 | 27 |
| 23 | Luton TownLuton | 29 | 7 | 5 | 17 | 29 | 48 | -19 | 26 |
| 24 | Plymouth ArgylePlymouth | 29 | 4 | 10 | 15 | 27 | 62 | -35 | 22 |
| > Championship Full Table | |||||||||
