Both players picked up the injuries in Spurs' 1-0 win over West Bromwich Albion at White Hart Lane on Tuesday.
"They both have tears," said Redknapp. "It's difficult to know how long they will be out for."
Gallas and Sandro join a list of casualties which include Scott Parker and Ledley King.
Restore Data
| Team | P | W | D | L | F | A | GD | PTS | |
| 1 | Liverpool | 21 | 15 | 5 | 1 | 50 | 20 | 30 | 50 |
| 2 | Arsenal | 22 | 12 | 8 | 2 | 43 | 21 | 22 | 44 |
| 3 | Nottingham ForestNott'm Forest | 21 | 12 | 5 | 4 | 30 | 20 | 10 | 41 |
| 4 | Newcastle UnitedNewcastle | 22 | 11 | 5 | 6 | 38 | 26 | 12 | 38 |
| 5 | Chelsea | 21 | 10 | 7 | 4 | 41 | 26 | 15 | 37 |
| 6 | Bournemouth | 22 | 10 | 7 | 5 | 36 | 26 | 10 | 37 |
| 7 | Aston Villa | 22 | 10 | 6 | 6 | 33 | 34 | -1 | 36 |
| 8 | Manchester CityMan City | 21 | 10 | 5 | 6 | 38 | 29 | 9 | 35 |
| 9 | Fulham | 22 | 8 | 9 | 5 | 34 | 30 | 4 | 33 |
| 10 | Brighton & Hove AlbionBrighton | 21 | 7 | 10 | 4 | 32 | 29 | 3 | 31 |
| 11 | Brentford | 22 | 8 | 4 | 10 | 40 | 39 | 1 | 28 |
| 12 | Crystal Palace | 22 | 6 | 9 | 7 | 25 | 28 | -3 | 27 |
| 13 | Manchester UnitedMan Utd | 21 | 7 | 5 | 9 | 26 | 29 | -3 | 26 |
| 14 | West Ham UnitedWest Ham | 22 | 7 | 5 | 10 | 27 | 43 | -16 | 26 |
| 15 | Tottenham HotspurSpurs | 21 | 7 | 3 | 11 | 43 | 32 | 11 | 24 |
| 16 | Everton | 20 | 3 | 8 | 9 | 15 | 26 | -11 | 17 |
| 17 | Wolverhampton WanderersWolves | 21 | 4 | 4 | 13 | 31 | 48 | -17 | 16 |
| 18 | Ipswich TownIpswich | 21 | 3 | 7 | 11 | 20 | 37 | -17 | 16 |
| 19 | Leicester CityLeicester | 22 | 3 | 5 | 14 | 23 | 48 | -25 | 14 |
| 20 | Southampton | 21 | 1 | 3 | 17 | 13 | 47 | -34 | 6 |
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