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 | Birmingham CityBirmingham | 9 | 7 | 1 | 1 | 17 | 9 | 8 | 22 |
| 2 | Wrexham | 10 | 6 | 2 | 2 | 18 | 8 | 10 | 20 |
| 3 | Mansfield TownMansfield | 9 | 6 | 2 | 1 | 17 | 11 | 6 | 20 |
| 4 | Lincoln CityLincoln | 9 | 5 | 3 | 1 | 15 | 8 | 7 | 18 |
| 5 | Wycombe WanderersWycombe | 9 | 5 | 2 | 2 | 17 | 13 | 4 | 17 |
| 6 | Stockport CountyStockport | 9 | 4 | 4 | 1 | 13 | 7 | 6 | 16 |
| 7 | Exeter CityExeter | 9 | 5 | 1 | 3 | 10 | 6 | 4 | 16 |
| 8 | Charlton AthleticCharlton | 10 | 5 | 1 | 4 | 10 | 9 | 1 | 16 |
| 9 | Huddersfield TownHuddersfield | 10 | 5 | 0 | 5 | 14 | 11 | 3 | 15 |
| 10 | Blackpool | 10 | 4 | 3 | 3 | 17 | 16 | 1 | 15 |
| 11 | Barnsley | 10 | 4 | 3 | 3 | 15 | 15 | 0 | 15 |
| 12 | Stevenage | 10 | 4 | 2 | 4 | 8 | 7 | 1 | 14 |
| 13 | Bolton WanderersBolton | 9 | 4 | 2 | 3 | 15 | 15 | 0 | 14 |
| 14 | Peterborough UnitedPeterborough | 10 | 4 | 2 | 4 | 16 | 18 | -2 | 14 |
| 15 | Wigan AthleticWigan | 10 | 3 | 4 | 3 | 9 | 5 | 4 | 13 |
| 16 | Reading | 9 | 4 | 1 | 4 | 13 | 14 | -1 | 13 |
| 17 | Rotherham UnitedRotherham | 10 | 3 | 4 | 3 | 9 | 11 | -2 | 13 |
| 18 | Bristol Rovers | 10 | 4 | 1 | 5 | 13 | 16 | -3 | 13 |
| 19 | Leyton Orient | 10 | 2 | 2 | 6 | 10 | 14 | -4 | 8 |
| 20 | Northampton TownNorthampton | 9 | 2 | 2 | 5 | 11 | 17 | -6 | 8 |
| 21 | Crawley TownCrawley | 9 | 2 | 1 | 6 | 5 | 13 | -8 | 7 |
| 22 | Shrewsbury TownShrewsbury | 10 | 1 | 2 | 7 | 8 | 17 | -9 | 5 |
| 23 | Burton Albion | 9 | 0 | 4 | 5 | 10 | 19 | -9 | 4 |
| 24 | Cambridge UnitedCambridge | 9 | 0 | 1 | 8 | 6 | 17 | -11 | 1 |
| > League One Full Table | |||||||||
