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 | 40 | 20 | 12 | 8 | 70 | 46 | 24 | 72 |
| 2 | Bradford CityBradford | 40 | 20 | 10 | 10 | 52 | 34 | 18 | 70 |
| 3 | Port Vale | 40 | 19 | 13 | 8 | 51 | 38 | 13 | 70 |
| 4 | Notts County | 40 | 19 | 11 | 10 | 61 | 39 | 22 | 68 |
| 5 | Doncaster RoversDoncaster | 39 | 19 | 10 | 10 | 59 | 46 | 13 | 67 |
| 6 | AFC Wimbledon | 40 | 18 | 11 | 11 | 53 | 31 | 22 | 65 |
| 7 | Grimsby Town | 40 | 19 | 5 | 16 | 54 | 57 | -3 | 62 |
| 8 | Crewe AlexandraCrewe | 40 | 15 | 16 | 9 | 47 | 39 | 8 | 61 |
| 9 | Colchester UnitedColchester | 40 | 14 | 17 | 9 | 48 | 40 | 8 | 59 |
| 10 | Chesterfield | 39 | 16 | 10 | 13 | 61 | 45 | 16 | 58 |
| 11 | Salford City | 39 | 15 | 12 | 12 | 48 | 44 | 4 | 57 |
| 12 | Fleetwood TownFleetwood | 40 | 14 | 14 | 12 | 57 | 49 | 8 | 56 |
| 13 | Bromley | 40 | 13 | 14 | 13 | 52 | 51 | 1 | 53 |
| 14 | Swindon TownSwindon | 40 | 12 | 15 | 13 | 57 | 57 | 0 | 51 |
| 15 | Cheltenham TownCheltenham | 40 | 13 | 11 | 16 | 51 | 59 | -8 | 50 |
| 16 | BarrowBarrow | 40 | 13 | 10 | 17 | 44 | 47 | -3 | 49 |
| 17 | Newport CountyNewport | 40 | 13 | 8 | 19 | 49 | 65 | -16 | 47 |
| 18 | MK Dons | 40 | 13 | 7 | 20 | 51 | 62 | -11 | 46 |
| 19 | Gillingham | 39 | 11 | 12 | 16 | 33 | 41 | -8 | 45 |
| 20 | Harrogate TownHarrogate | 40 | 12 | 9 | 19 | 33 | 51 | -18 | 45 |
| 21 | Accrington StanleyAccrington | 40 | 10 | 12 | 18 | 46 | 59 | -13 | 42 |
| 22 | Tranmere RoversTranmere | 40 | 9 | 13 | 18 | 32 | 58 | -26 | 40 |
| 23 | Morecambe | 40 | 10 | 6 | 24 | 36 | 57 | -21 | 36 |
| 24 | Carlisle UnitedCarlisle | 40 | 7 | 10 | 23 | 31 | 61 | -30 | 31 |
| > League Two Full Table | |||||||||
