The 28-year-old's deal with the League One club is due to expire on January 13.
He arrives at Ashton Gate having previously worked under City boss Sean O'Driscoll at Bournemouth and Doncaster Rovers.
O'Connor joined Derby from Doncaster last summer on a two-year contract with the option of a further 12 months.
Restore Data
| Team | P | W | D | L | F | A | GD | PTS | |
| 1 | West Bromwich AlbionWest Brom | 5 | 4 | 1 | 0 | 9 | 2 | 7 | 13 |
| 2 | Sunderland | 5 | 4 | 0 | 1 | 12 | 4 | 8 | 12 |
| 3 | Blackburn RoversBlackburn | 5 | 3 | 2 | 0 | 12 | 6 | 6 | 11 |
| 4 | Burnley | 5 | 3 | 1 | 1 | 11 | 3 | 8 | 10 |
| 5 | Watford | 5 | 3 | 1 | 1 | 9 | 5 | 4 | 10 |
| 6 | Sheffield UnitedSheff Utd | 5 | 3 | 2 | 0 | 8 | 3 | 5 | 9 |
| 7 | Oxford UnitedOxford Utd | 5 | 3 | 0 | 2 | 9 | 6 | 3 | 9 |
| 8 | Derby CountyDerby | 5 | 3 | 0 | 2 | 8 | 6 | 2 | 9 |
| 9 | Leeds UnitedLeeds | 5 | 2 | 2 | 1 | 7 | 4 | 3 | 8 |
| 10 | Middlesbrough | 5 | 2 | 2 | 1 | 6 | 4 | 2 | 8 |
| 11 | Swansea CitySwansea | 5 | 2 | 1 | 2 | 5 | 3 | 2 | 7 |
| 12 | Queens Park RangersQPR | 5 | 1 | 3 | 1 | 7 | 8 | -1 | 6 |
| 13 | Stoke CityStoke | 5 | 2 | 0 | 3 | 3 | 6 | -3 | 6 |
| 14 | Coventry CityCoventry | 5 | 1 | 2 | 2 | 5 | 6 | -1 | 5 |
| 15 | Norwich CityNorwich | 5 | 1 | 2 | 2 | 4 | 6 | -2 | 5 |
| 16 | Plymouth ArgylePlymouth | 5 | 1 | 2 | 2 | 5 | 9 | -4 | 5 |
| 17 | Bristol City | 5 | 1 | 2 | 2 | 6 | 11 | -5 | 5 |
| 18 | Millwall | 5 | 1 | 1 | 3 | 8 | 8 | 0 | 4 |
| 19 | Luton TownLuton | 5 | 1 | 1 | 3 | 3 | 7 | -4 | 4 |
| 20 | Sheffield WednesdaySheff Weds | 5 | 1 | 1 | 3 | 5 | 10 | -5 | 4 |
| 21 | Preston North EndPreston | 5 | 1 | 1 | 3 | 3 | 9 | -6 | 4 |
| 22 | Hull City | 5 | 0 | 3 | 2 | 2 | 6 | -4 | 3 |
| 23 | Portsmouth | 5 | 0 | 3 | 2 | 6 | 11 | -5 | 3 |
| 24 | Cardiff CityCardiff | 5 | 0 | 1 | 4 | 1 | 11 | -10 | 1 |
| > Championship Full Table | |||||||||
