The Costa Rican international suffered the injury during Fulham's 3-0 victory against Bolton Wanderers on Saturday afternoon.
Speaking to Sky Sports News prior to this evening's match against Chelsea, Fulham boss Martin Jol confirmed that it will take Ruiz around two months to make a full recovery.
The 26-year-old joined the Whites last summer from FC Twente.
Restore Data
| Team | P | W | D | L | F | A | GD | PTS | |
| 1 | Liverpool | 22 | 16 | 5 | 1 | 54 | 21 | 33 | 53 |
| 2 | Arsenal | 23 | 13 | 8 | 2 | 44 | 21 | 23 | 47 |
| 3 | Nottingham ForestNott'm Forest | 23 | 13 | 5 | 5 | 33 | 27 | 6 | 44 |
| 4 | Manchester CityMan City | 23 | 12 | 5 | 6 | 47 | 30 | 17 | 41 |
| 5 | Newcastle UnitedNewcastle | 23 | 12 | 5 | 6 | 41 | 27 | 14 | 41 |
| 6 | Chelsea | 23 | 11 | 7 | 5 | 45 | 30 | 15 | 40 |
| 7 | Bournemouth | 23 | 11 | 7 | 5 | 41 | 26 | 15 | 40 |
| 8 | Aston Villa | 23 | 10 | 7 | 6 | 34 | 35 | -1 | 37 |
| 9 | Brighton & Hove AlbionBrighton | 23 | 8 | 10 | 5 | 35 | 31 | 4 | 34 |
| 10 | Fulham | 23 | 8 | 9 | 6 | 34 | 31 | 3 | 33 |
| 11 | Brentford | 23 | 9 | 4 | 10 | 42 | 40 | 2 | 31 |
| 12 | Manchester UnitedMan Utd | 23 | 8 | 5 | 10 | 28 | 32 | -4 | 29 |
| 13 | Crystal Palace | 23 | 6 | 9 | 8 | 26 | 30 | -4 | 27 |
| 14 | West Ham UnitedWest Ham | 23 | 7 | 6 | 10 | 28 | 44 | -16 | 27 |
| 15 | Tottenham HotspurSpurs | 23 | 7 | 3 | 13 | 46 | 37 | 9 | 24 |
| 16 | Everton | 22 | 5 | 8 | 9 | 19 | 28 | -9 | 23 |
| 17 | Leicester CityLeicester | 23 | 4 | 5 | 14 | 25 | 49 | -24 | 17 |
| 18 | Wolverhampton WanderersWolves | 23 | 4 | 4 | 15 | 32 | 52 | -20 | 16 |
| 19 | Ipswich TownIpswich | 23 | 3 | 7 | 13 | 21 | 47 | -26 | 16 |
| 20 | Southampton | 23 | 1 | 3 | 19 | 16 | 53 | -37 | 6 |
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