The 26-year-old picked up the problem during Wednesday night's FA Cup third-round replay defeat at Arsenal.
"We had bad news after losing the other day, we have lost Kemy Agustien for, I think, the next four weeks with his ankle," Swans boss Michael Laudrup told reporters.
Agustien signed a two-year contract extension at the Liberty Stadium in May.
Restore Data
| Team | P | W | D | L | F | A | GD | PTS | |
| 1 | Sunderland | 8 | 6 | 0 | 2 | 16 | 6 | 10 | 18 |
| 2 | Burnley | 8 | 5 | 2 | 1 | 14 | 4 | 10 | 17 |
| 3 | West Bromwich AlbionWest Brom | 8 | 5 | 1 | 2 | 12 | 6 | 6 | 16 |
| 4 | Leeds UnitedLeeds | 8 | 4 | 3 | 1 | 13 | 5 | 8 | 15 |
| 5 | Blackburn RoversBlackburn | 8 | 4 | 3 | 1 | 14 | 9 | 5 | 15 |
| 6 | Middlesbrough | 8 | 4 | 2 | 2 | 9 | 5 | 4 | 14 |
| 7 | Sheffield UnitedSheff Utd | 7 | 4 | 3 | 0 | 9 | 3 | 6 | 13 |
| 8 | Watford | 7 | 4 | 1 | 2 | 12 | 10 | 2 | 13 |
| 9 | Hull City | 8 | 3 | 3 | 2 | 12 | 9 | 3 | 12 |
| 10 | Norwich CityNorwich | 8 | 3 | 3 | 2 | 12 | 10 | 2 | 12 |
| 11 | Swansea CitySwansea | 7 | 3 | 2 | 2 | 8 | 5 | 3 | 11 |
| 12 | Oxford UnitedOxford Utd | 8 | 3 | 2 | 3 | 12 | 10 | 2 | 11 |
| 13 | Derby CountyDerby | 8 | 3 | 0 | 5 | 10 | 12 | -2 | 9 |
| 14 | Bristol City | 7 | 2 | 3 | 2 | 9 | 13 | -4 | 9 |
| 15 | Millwall | 8 | 2 | 2 | 4 | 12 | 11 | 1 | 8 |
| 16 | Coventry CityCoventry | 8 | 2 | 2 | 4 | 9 | 11 | -2 | 8 |
| 17 | Plymouth ArgylePlymouth | 8 | 2 | 2 | 4 | 8 | 12 | -4 | 8 |
| 18 | Luton TownLuton | 8 | 2 | 2 | 4 | 8 | 13 | -5 | 8 |
| 19 | Sheffield WednesdaySheff Weds | 7 | 2 | 1 | 4 | 9 | 14 | -5 | 7 |
| 20 | Queens Park RangersQPR | 8 | 1 | 4 | 3 | 9 | 14 | -5 | 7 |
| 21 | Stoke CityStoke | 7 | 2 | 0 | 5 | 4 | 11 | -7 | 6 |
| 22 | Preston North EndPreston | 7 | 1 | 2 | 4 | 4 | 12 | -8 | 5 |
| 23 | Portsmouth | 7 | 0 | 4 | 3 | 7 | 13 | -6 | 4 |
| 24 | Cardiff CityCardiff | 8 | 1 | 1 | 6 | 3 | 17 | -14 | 4 |
| > Championship Full Table | |||||||||
