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 | Port Vale | 17 | 10 | 4 | 3 | 25 | 17 | 8 | 34 |
| 2 | Walsall | 16 | 9 | 4 | 3 | 30 | 17 | 13 | 31 |
| 3 | Crewe AlexandraCrewe | 16 | 8 | 5 | 3 | 20 | 14 | 6 | 29 |
| 4 | Doncaster RoversDoncaster | 17 | 8 | 5 | 4 | 22 | 18 | 4 | 29 |
| 5 | Notts County | 17 | 7 | 7 | 3 | 23 | 15 | 8 | 28 |
| 6 | MK Dons | 16 | 8 | 3 | 5 | 27 | 19 | 8 | 27 |
| 7 | AFC Wimbledon | 16 | 8 | 2 | 6 | 25 | 14 | 11 | 26 |
| 8 | Chesterfield | 17 | 6 | 7 | 4 | 30 | 20 | 10 | 25 |
| 9 | Grimsby Town | 17 | 8 | 1 | 8 | 19 | 26 | -7 | 25 |
| 10 | Bradford CityBradford | 16 | 6 | 5 | 5 | 21 | 17 | 4 | 23 |
| 11 | Gillingham | 16 | 7 | 2 | 7 | 17 | 14 | 3 | 23 |
| 12 | BarrowBarrow | 17 | 6 | 4 | 7 | 17 | 16 | 1 | 22 |
| 13 | Fleetwood TownFleetwood | 14 | 5 | 6 | 3 | 20 | 15 | 5 | 21 |
| 14 | Cheltenham TownCheltenham | 17 | 6 | 3 | 8 | 22 | 25 | -3 | 21 |
| 15 | Salford City | 16 | 5 | 6 | 5 | 15 | 18 | -3 | 21 |
| 16 | Newport CountyNewport | 17 | 6 | 3 | 8 | 19 | 26 | -7 | 21 |
| 17 | Harrogate TownHarrogate | 17 | 6 | 3 | 8 | 16 | 23 | -7 | 21 |
| 18 | Accrington StanleyAccrington | 16 | 4 | 6 | 6 | 22 | 26 | -4 | 18 |
| 19 | Bromley | 16 | 3 | 8 | 5 | 19 | 21 | -2 | 17 |
| 20 | Colchester UnitedColchester | 16 | 3 | 8 | 5 | 19 | 22 | -3 | 17 |
| 21 | Tranmere RoversTranmere | 16 | 4 | 5 | 7 | 10 | 20 | -10 | 17 |
| 22 | Swindon TownSwindon | 17 | 2 | 7 | 8 | 20 | 28 | -8 | 13 |
| 23 | Morecambe | 17 | 3 | 4 | 10 | 17 | 29 | -12 | 13 |
| 24 | Carlisle UnitedCarlisle | 17 | 3 | 4 | 10 | 14 | 29 | -15 | 13 |
| > League Two Full Table | |||||||||
