The 23-year-old left the Millers at the end of last season after having his contract terminated by mutual consent.
Newton, who started his career at Newcastle United, made 14 appearances for the Championship club during the 2014-15 campaign.
Cambridge start the new League Two season at home to Newport County on August 8.
Restore Data
| Team | P | W | D | L | F | A | GD | PTS | |
| 1 | Wycombe WanderersWycombe | 18 | 12 | 4 | 2 | 39 | 21 | 18 | 40 |
| 2 | Wrexham | 19 | 12 | 4 | 3 | 28 | 11 | 17 | 40 |
| 3 | Birmingham CityBirmingham | 17 | 12 | 3 | 2 | 32 | 16 | 16 | 39 |
| 4 | Huddersfield TownHuddersfield | 18 | 11 | 2 | 5 | 28 | 16 | 12 | 35 |
| 5 | Stockport CountyStockport | 19 | 9 | 6 | 4 | 31 | 19 | 12 | 33 |
| 6 | Reading | 18 | 9 | 4 | 5 | 30 | 25 | 5 | 31 |
| 7 | Bolton WanderersBolton | 18 | 9 | 3 | 6 | 28 | 29 | -1 | 30 |
| 8 | Barnsley | 19 | 7 | 6 | 6 | 27 | 25 | 2 | 27 |
| 9 | Lincoln CityLincoln | 19 | 7 | 6 | 6 | 24 | 23 | 1 | 27 |
| 10 | Mansfield TownMansfield | 17 | 7 | 3 | 7 | 22 | 22 | 0 | 24 |
| 11 | Exeter CityExeter | 18 | 7 | 3 | 8 | 16 | 19 | -3 | 24 |
| 12 | Wigan AthleticWigan | 19 | 6 | 5 | 8 | 17 | 16 | 1 | 23 |
| 13 | Charlton AthleticCharlton | 18 | 6 | 5 | 7 | 18 | 19 | -1 | 23 |
| 14 | Blackpool | 18 | 6 | 5 | 7 | 26 | 31 | -5 | 23 |
| 15 | Leyton Orient | 19 | 6 | 4 | 9 | 19 | 20 | -1 | 22 |
| 16 | Stevenage | 17 | 6 | 4 | 7 | 13 | 16 | -3 | 22 |
| 17 | Peterborough UnitedPeterborough | 18 | 6 | 3 | 9 | 33 | 32 | 1 | 21 |
| 18 | Northampton TownNorthampton | 19 | 5 | 6 | 8 | 21 | 26 | -5 | 21 |
| 19 | Bristol Rovers | 18 | 6 | 3 | 9 | 17 | 26 | -9 | 21 |
| 20 | Rotherham UnitedRotherham | 17 | 5 | 5 | 7 | 16 | 20 | -4 | 20 |
| 21 | Crawley TownCrawley | 18 | 5 | 4 | 9 | 17 | 28 | -11 | 19 |
| 22 | Cambridge UnitedCambridge | 18 | 4 | 4 | 10 | 18 | 29 | -11 | 16 |
| 23 | Burton Albion | 19 | 2 | 6 | 11 | 16 | 30 | -14 | 12 |
| 24 | Shrewsbury TownShrewsbury | 18 | 3 | 2 | 13 | 18 | 35 | -17 | 11 |
| > League One Full Table | |||||||||
