The winger was forced off in the 75th minute of the Black Cats' 1-0 win at Southampton with what looked to be a leg problem.
"I'm hoping it's not too serious," O'Neill told Sky Sports News. "The way he limped towards me, it didn't look all that inviting."
Sunderland are now in 15th place in the Premier League table following Saturday's victory.
Restore Data
| Team | P | W | D | L | F | A | GD | PTS | |
| 1 | Sunderland | 13 | 9 | 2 | 2 | 23 | 9 | 14 | 29 |
| 2 | Sheffield UnitedSheff Utd | 14 | 9 | 3 | 2 | 18 | 7 | 11 | 28 |
| 3 | Leeds UnitedLeeds | 13 | 7 | 5 | 1 | 22 | 8 | 14 | 26 |
| 4 | Burnley | 13 | 6 | 5 | 2 | 17 | 6 | 11 | 23 |
| 5 | Watford | 14 | 7 | 1 | 6 | 22 | 22 | 0 | 22 |
| 6 | West Bromwich AlbionWest Brom | 13 | 5 | 6 | 2 | 14 | 8 | 6 | 21 |
| 7 | Middlesbrough | 14 | 6 | 3 | 5 | 18 | 16 | 2 | 21 |
| 8 | Millwall | 13 | 5 | 4 | 4 | 16 | 12 | 4 | 19 |
| 9 | Blackburn RoversBlackburn | 13 | 5 | 4 | 4 | 16 | 14 | 2 | 19 |
| 10 | Swansea CitySwansea | 14 | 5 | 4 | 5 | 11 | 9 | 2 | 19 |
| 11 | Bristol City | 14 | 4 | 7 | 3 | 18 | 19 | -1 | 19 |
| 12 | Norwich CityNorwich | 14 | 4 | 6 | 4 | 23 | 20 | 3 | 18 |
| 13 | Sheffield WednesdaySheff Weds | 14 | 5 | 3 | 6 | 17 | 24 | -7 | 18 |
| 14 | Oxford UnitedOxford Utd | 14 | 4 | 5 | 5 | 17 | 17 | 0 | 17 |
| 15 | Coventry CityCoventry | 13 | 4 | 3 | 6 | 17 | 17 | 0 | 15 |
| 16 | Derby CountyDerby | 13 | 4 | 3 | 6 | 16 | 17 | -1 | 15 |
| 17 | Stoke CityStoke | 13 | 4 | 3 | 6 | 15 | 18 | -3 | 15 |
| 18 | Hull City | 14 | 3 | 6 | 5 | 15 | 18 | -3 | 15 |
| 19 | Cardiff CityCardiff | 13 | 4 | 3 | 6 | 13 | 19 | -6 | 15 |
| 20 | Plymouth ArgylePlymouth | 14 | 4 | 3 | 7 | 14 | 25 | -11 | 15 |
| 21 | Preston North EndPreston | 13 | 3 | 5 | 5 | 14 | 20 | -6 | 14 |
| 22 | Luton TownLuton | 13 | 3 | 3 | 7 | 15 | 21 | -6 | 12 |
| 23 | Queens Park RangersQPR | 14 | 1 | 7 | 6 | 12 | 23 | -11 | 10 |
| 24 | Portsmouth | 14 | 1 | 6 | 7 | 13 | 27 | -14 | 9 |
| > Championship Full Table | |||||||||
