The 24-year-old only made four starts for the Canaries since joining from Stockport County in 2010.
"Oli was a massive part of our season and promotion from League One and we wish him all the best for the future," said manager Paul Lambert.
Johnson is expected to join Yeovil Town, a club where he spent part of this season on loan.
Restore Data
| Team | P | W | D | L | F | A | GD | PTS | |
| 1 | Leeds UnitedLeeds | 26 | 15 | 8 | 3 | 48 | 19 | 29 | 53 |
| 2 | Burnley | 26 | 14 | 10 | 2 | 31 | 9 | 22 | 52 |
| 3 | Sheffield UnitedSheff Utd | 26 | 16 | 6 | 4 | 36 | 17 | 19 | 52 |
| 4 | Sunderland | 26 | 14 | 8 | 4 | 39 | 22 | 17 | 50 |
| 5 | Middlesbrough | 26 | 11 | 8 | 7 | 43 | 32 | 11 | 41 |
| 6 | West Bromwich AlbionWest Brom | 26 | 9 | 13 | 4 | 32 | 21 | 11 | 40 |
| 7 | Blackburn RoversBlackburn | 25 | 11 | 6 | 8 | 28 | 23 | 5 | 39 |
| 8 | Bristol City | 26 | 9 | 10 | 7 | 33 | 30 | 3 | 37 |
| 9 | Watford | 25 | 11 | 4 | 10 | 35 | 36 | -1 | 37 |
| 10 | Sheffield WednesdaySheff Weds | 26 | 10 | 7 | 9 | 38 | 40 | -2 | 37 |
| 11 | Norwich CityNorwich | 26 | 9 | 9 | 8 | 43 | 37 | 6 | 36 |
| 12 | Swansea CitySwansea | 26 | 9 | 7 | 10 | 30 | 30 | 0 | 34 |
| 13 | Queens Park RangersQPR | 26 | 7 | 11 | 8 | 29 | 34 | -5 | 32 |
| 14 | Millwall | 25 | 7 | 9 | 9 | 24 | 23 | 1 | 30 |
| 15 | Preston North EndPreston | 26 | 6 | 12 | 8 | 28 | 34 | -6 | 30 |
| 16 | Coventry CityCoventry | 26 | 7 | 8 | 11 | 34 | 37 | -3 | 29 |
| 17 | Oxford UnitedOxford Utd | 25 | 7 | 7 | 11 | 28 | 40 | -12 | 28 |
| 18 | Derby CountyDerby | 26 | 7 | 6 | 13 | 31 | 35 | -4 | 27 |
| 19 | Stoke CityStoke | 26 | 6 | 9 | 11 | 24 | 32 | -8 | 27 |
| 20 | Luton TownLuton | 26 | 7 | 4 | 15 | 27 | 44 | -17 | 25 |
| 21 | Portsmouth | 24 | 5 | 8 | 11 | 30 | 41 | -11 | 23 |
| 22 | Hull City | 26 | 5 | 8 | 13 | 25 | 36 | -11 | 23 |
| 23 | Cardiff CityCardiff | 25 | 5 | 8 | 12 | 25 | 40 | -15 | 23 |
| 24 | Plymouth ArgylePlymouth | 25 | 4 | 8 | 13 | 24 | 53 | -29 | 20 |
| > Championship Full Table | |||||||||
