The Manchester United striker is the Championship side's fourth signing of the day.
The 21-year-old said: "I had a taste for the Championship in a loan spell at Wigan Athletic earlier in the season, and really enjoyed that.
"I'm looking to get some more games under my belt, and hoping to help the team get back up to the Premier League."
Keane will wear the number 12 shirt during his spell at Loftus Road.
Restore Data
| Team | P | W | D | L | F | A | GD | PTS | |
| 1 | Liverpool | 12 | 10 | 1 | 1 | 24 | 8 | 16 | 31 |
| 2 | Arsenal | 13 | 7 | 4 | 2 | 26 | 14 | 12 | 25 |
| 3 | Manchester CityMan City | 12 | 7 | 2 | 3 | 22 | 17 | 5 | 23 |
| 4 | Brighton & Hove AlbionBrighton | 13 | 6 | 5 | 2 | 22 | 17 | 5 | 23 |
| 5 | Chelsea | 12 | 6 | 4 | 2 | 23 | 14 | 9 | 22 |
| 6 | Nottingham ForestNott'm Forest | 13 | 6 | 4 | 3 | 16 | 13 | 3 | 22 |
| 7 | Brentford | 13 | 6 | 2 | 5 | 26 | 23 | 3 | 20 |
| 8 | Tottenham HotspurSpurs | 12 | 6 | 1 | 5 | 27 | 13 | 14 | 19 |
| 9 | Aston Villa | 12 | 5 | 4 | 3 | 19 | 19 | 0 | 19 |
| 10 | Newcastle UnitedNewcastle | 13 | 5 | 4 | 4 | 14 | 14 | 0 | 19 |
| 11 | Bournemouth | 13 | 5 | 3 | 5 | 20 | 19 | 1 | 18 |
| 12 | Fulham | 12 | 5 | 3 | 4 | 17 | 17 | 0 | 18 |
| 13 | Manchester UnitedMan Utd | 12 | 4 | 4 | 4 | 13 | 13 | 0 | 16 |
| 14 | West Ham UnitedWest Ham | 13 | 4 | 3 | 6 | 17 | 24 | -7 | 15 |
| 15 | Everton | 12 | 2 | 5 | 5 | 10 | 17 | -7 | 11 |
| 16 | Leicester CityLeicester | 13 | 2 | 4 | 7 | 16 | 27 | -11 | 10 |
| 17 | Crystal Palace | 13 | 1 | 6 | 6 | 11 | 18 | -7 | 9 |
| 18 | Wolverhampton WanderersWolves | 13 | 2 | 3 | 8 | 22 | 32 | -10 | 9 |
| 19 | Ipswich TownIpswich | 13 | 1 | 6 | 6 | 13 | 24 | -11 | 9 |
| 20 | Southampton | 13 | 1 | 2 | 10 | 10 | 25 | -15 | 5 |
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