The 28-year-old, who can operate on either wing, joined up with the Black Cats on their pre-season tour of Italy before completing his move on Tuesday.
The club's official website has revealed that the two-time Serie A winner has committed his future to the English outfit for the next four years.
It is believed that the Premier League club have parted with £8.5m for his services.
Restore Data
| Team | P | W | D | L | F | A | GD | PTS | |
| 1 | Sunderland | 4 | 4 | 0 | 0 | 10 | 1 | 9 | 12 |
| 2 | West Bromwich AlbionWest Brom | 4 | 3 | 1 | 0 | 6 | 2 | 4 | 10 |
| 3 | Watford | 4 | 3 | 0 | 1 | 8 | 4 | 4 | 9 |
| 4 | Leeds UnitedLeeds | 4 | 2 | 2 | 0 | 7 | 3 | 4 | 8 |
| 5 | Blackburn RoversBlackburn | 4 | 2 | 2 | 0 | 9 | 6 | 3 | 8 |
| 6 | Burnley | 4 | 2 | 1 | 1 | 10 | 3 | 7 | 7 |
| 7 | Middlesbrough | 4 | 2 | 1 | 1 | 5 | 3 | 2 | 7 |
| 8 | Sheffield UnitedSheff Utd | 4 | 2 | 2 | 0 | 6 | 3 | 3 | 6 |
| 9 | Oxford UnitedOxford Utd | 4 | 2 | 0 | 2 | 8 | 6 | 2 | 6 |
| 10 | Derby CountyDerby | 4 | 2 | 0 | 2 | 7 | 6 | 1 | 6 |
| 11 | Stoke CityStoke | 4 | 2 | 0 | 2 | 3 | 5 | -2 | 6 |
| 12 | Queens Park RangersQPR | 4 | 1 | 2 | 1 | 6 | 7 | -1 | 5 |
| 13 | Norwich CityNorwich | 4 | 1 | 2 | 1 | 4 | 5 | -1 | 5 |
| 14 | Bristol City | 4 | 1 | 2 | 1 | 6 | 8 | -2 | 5 |
| 15 | Millwall | 4 | 1 | 1 | 2 | 8 | 7 | 1 | 4 |
| 16 | Swansea CitySwansea | 4 | 1 | 1 | 2 | 4 | 3 | 1 | 4 |
| 17 | Coventry CityCoventry | 4 | 1 | 1 | 2 | 4 | 5 | -1 | 4 |
| 18 | Portsmouth | 4 | 0 | 3 | 1 | 6 | 8 | -2 | 3 |
| 19 | Hull City | 4 | 0 | 3 | 1 | 2 | 4 | -2 | 3 |
| 20 | Sheffield WednesdaySheff Weds | 4 | 1 | 0 | 3 | 4 | 9 | -5 | 3 |
| 21 | Preston North EndPreston | 4 | 1 | 0 | 3 | 2 | 8 | -6 | 3 |
| 22 | Plymouth ArgylePlymouth | 4 | 0 | 2 | 2 | 2 | 7 | -5 | 2 |
| 23 | Luton TownLuton | 4 | 0 | 1 | 3 | 2 | 7 | -5 | 1 |
| 24 | Cardiff CityCardiff | 4 | 0 | 1 | 3 | 1 | 10 | -9 | 1 |
| > Championship Full Table | |||||||||
