The 20-year-old, who signed a three-year deal with the Tykes during the summer, will remain with the Dons until January 5.
Jennings has made just five appearances for Barnsley this season since joining the club from Bayern Munich.
MK Dons, who sit 11th in League One, face Coventry City on Saturday.
Restore Data
| Team | P | W | D | L | F | A | GD | PTS | |
| 1 | Walsall | 24 | 17 | 4 | 3 | 48 | 21 | 27 | 55 |
| 2 | Crewe AlexandraCrewe | 25 | 11 | 10 | 4 | 33 | 22 | 11 | 43 |
| 3 | Salford City | 24 | 12 | 6 | 6 | 29 | 19 | 10 | 42 |
| 4 | Port Vale | 25 | 11 | 8 | 6 | 29 | 25 | 4 | 41 |
| 5 | AFC Wimbledon | 23 | 12 | 4 | 7 | 35 | 19 | 16 | 40 |
| 6 | Notts County | 24 | 11 | 7 | 6 | 38 | 26 | 12 | 40 |
| 7 | Doncaster RoversDoncaster | 25 | 11 | 7 | 7 | 35 | 30 | 5 | 40 |
| 8 | Bradford CityBradford | 24 | 10 | 8 | 6 | 33 | 27 | 6 | 38 |
| 9 | Grimsby Town | 25 | 12 | 1 | 12 | 36 | 40 | -4 | 37 |
| 10 | Chesterfield | 24 | 9 | 7 | 8 | 38 | 29 | 9 | 34 |
| 11 | MK Dons | 23 | 10 | 4 | 9 | 36 | 31 | 5 | 34 |
| 12 | Bromley | 24 | 8 | 10 | 6 | 35 | 30 | 5 | 34 |
| 13 | Cheltenham TownCheltenham | 24 | 8 | 7 | 9 | 34 | 36 | -2 | 31 |
| 14 | Gillingham | 23 | 9 | 3 | 11 | 22 | 24 | -2 | 30 |
| 15 | BarrowBarrow | 24 | 7 | 7 | 10 | 23 | 26 | -3 | 28 |
| 16 | Fleetwood TownFleetwood | 22 | 6 | 9 | 7 | 28 | 28 | 0 | 27 |
| 17 | Colchester UnitedColchester | 24 | 5 | 12 | 7 | 28 | 28 | 0 | 27 |
| 18 | Newport CountyNewport | 23 | 7 | 5 | 11 | 30 | 40 | -10 | 26 |
| 19 | Accrington StanleyAccrington | 23 | 6 | 7 | 10 | 32 | 40 | -8 | 25 |
| 20 | Swindon TownSwindon | 26 | 5 | 10 | 11 | 31 | 41 | -10 | 25 |
| 21 | Harrogate TownHarrogate | 25 | 7 | 4 | 14 | 21 | 37 | -16 | 25 |
| 22 | Tranmere RoversTranmere | 24 | 6 | 7 | 11 | 18 | 37 | -19 | 25 |
| 23 | Morecambe | 24 | 5 | 5 | 14 | 22 | 39 | -17 | 20 |
| 24 | Carlisle UnitedCarlisle | 24 | 4 | 6 | 14 | 19 | 38 | -19 | 18 |
| > League Two Full Table | |||||||||
