The 27-year-old joined Forest from Doncaster Rovers in the summer, with an initial contract that was due to expire at the end of January.
However, the midfielder has become a regular in the Forest side this season, making 25 appearances in all competitions.
The new deal will keep Gillet at the City Ground until at least 2014.
Restore Data
| Team | P | W | D | L | F | A | GD | PTS | |
| 1 | Manchester CityMan City | 2 | 2 | 0 | 0 | 6 | 1 | 5 | 6 |
| 2 | Brighton & Hove AlbionBrighton | 2 | 2 | 0 | 0 | 5 | 1 | 4 | 6 |
| 3 | Arsenal | 2 | 2 | 0 | 0 | 4 | 0 | 4 | 6 |
| 4 | Liverpool | 2 | 2 | 0 | 0 | 4 | 0 | 4 | 6 |
| 5 | Tottenham HotspurSpurs | 2 | 1 | 1 | 0 | 5 | 1 | 4 | 4 |
| 6 | Nottingham ForestNott'm Forest | 2 | 1 | 1 | 0 | 2 | 1 | 1 | 4 |
| 7 | Newcastle UnitedNewcastle | 2 | 1 | 1 | 0 | 2 | 1 | 1 | 4 |
| 8 | Chelsea | 2 | 1 | 0 | 1 | 6 | 4 | 2 | 3 |
| 9 | West Ham UnitedWest Ham | 2 | 1 | 0 | 1 | 3 | 2 | 1 | 3 |
| 10 | Fulham | 2 | 1 | 0 | 1 | 2 | 2 | 0 | 3 |
| 11 | Manchester UnitedMan Utd | 2 | 1 | 0 | 1 | 2 | 2 | 0 | 3 |
| 12 | Aston Villa | 2 | 1 | 0 | 1 | 2 | 3 | -1 | 3 |
| 13 | Brentford | 2 | 1 | 0 | 1 | 2 | 3 | -1 | 3 |
| 14 | Bournemouth | 2 | 0 | 2 | 0 | 2 | 2 | 0 | 2 |
| 15 | Leicester CityLeicester | 2 | 0 | 1 | 1 | 2 | 3 | -1 | 1 |
| 16 | Southampton | 2 | 0 | 0 | 2 | 0 | 2 | -2 | 0 |
| 17 | Crystal Palace | 2 | 0 | 0 | 2 | 1 | 4 | -3 | 0 |
| 18 | Ipswich TownIpswich | 2 | 0 | 0 | 2 | 1 | 6 | -5 | 0 |
| 19 | Wolverhampton WanderersWolves | 2 | 0 | 0 | 2 | 2 | 8 | -6 | 0 |
| 20 | Everton | 2 | 0 | 0 | 2 | 0 | 7 | -7 | 0 |
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