The left-back arrived at London Road last month on an initial four-week deal.
However, having made five appearances for Posh, all parties have decided that Elder will now remain with the League One club until January.
The Australian youth international is yet to make his senior debut for Premier League side Leicester.
Restore Data
| Team | P | W | D | L | F | A | GD | PTS | |
| 1 | Liverpool | 18 | 14 | 3 | 1 | 45 | 17 | 28 | 45 |
| 2 | Arsenal | 19 | 11 | 6 | 2 | 38 | 17 | 21 | 39 |
| 3 | Nottingham ForestNott'm Forest | 19 | 11 | 4 | 4 | 26 | 19 | 7 | 37 |
| 4 | Chelsea | 19 | 10 | 5 | 4 | 38 | 23 | 15 | 35 |
| 5 | Newcastle UnitedNewcastle | 19 | 9 | 5 | 5 | 32 | 21 | 11 | 32 |
| 6 | Manchester CityMan City | 19 | 9 | 4 | 6 | 32 | 26 | 6 | 31 |
| 7 | Bournemouth | 19 | 8 | 6 | 5 | 29 | 23 | 6 | 30 |
| 8 | Fulham | 19 | 7 | 8 | 4 | 28 | 25 | 3 | 29 |
| 9 | Aston Villa | 19 | 8 | 5 | 6 | 28 | 31 | -3 | 29 |
| 10 | Brighton & Hove AlbionBrighton | 19 | 6 | 9 | 4 | 29 | 28 | 1 | 27 |
| 11 | Tottenham HotspurSpurs | 19 | 7 | 3 | 9 | 41 | 28 | 13 | 24 |
| 12 | Brentford | 19 | 7 | 3 | 9 | 33 | 35 | -2 | 24 |
| 13 | West Ham UnitedWest Ham | 19 | 6 | 5 | 8 | 23 | 35 | -12 | 23 |
| 14 | Manchester UnitedMan Utd | 19 | 6 | 4 | 9 | 21 | 26 | -5 | 22 |
| 15 | Crystal Palace | 19 | 4 | 8 | 7 | 20 | 27 | -7 | 20 |
| 16 | Everton | 18 | 3 | 8 | 7 | 15 | 24 | -9 | 17 |
| 17 | Wolverhampton WanderersWolves | 19 | 4 | 4 | 11 | 31 | 42 | -11 | 16 |
| 18 | Ipswich TownIpswich | 19 | 3 | 6 | 10 | 18 | 33 | -15 | 15 |
| 19 | Leicester CityLeicester | 19 | 3 | 5 | 11 | 22 | 42 | -20 | 14 |
| 20 | Southampton | 19 | 1 | 3 | 15 | 12 | 39 | -27 | 6 |
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