The 22-year-old, whose Trotters contract was due to expire this month, has put pen to paper on a three-year deal at the Stadio Artemio Franchi.
Alonso moved to the Reebok Stadium from Real Madrid in July 2010.
He made 46 first-team appearances during his time in England.
Restore Data
| Team | P | W | D | L | F | A | GD | PTS | |
| 1 | Birmingham CityBirmingham | 27 | 19 | 6 | 2 | 46 | 19 | 27 | 63 |
| 2 | Wycombe WanderersWycombe | 29 | 17 | 8 | 4 | 55 | 30 | 25 | 59 |
| 3 | Wrexham | 29 | 16 | 7 | 6 | 43 | 25 | 18 | 55 |
| 4 | Stockport CountyStockport | 29 | 14 | 8 | 7 | 44 | 28 | 16 | 50 |
| 5 | Huddersfield TownHuddersfield | 28 | 14 | 6 | 8 | 41 | 26 | 15 | 48 |
| 6 | Leyton Orient | 28 | 13 | 5 | 10 | 40 | 25 | 15 | 44 |
| 7 | Charlton AthleticCharlton | 28 | 12 | 8 | 8 | 36 | 28 | 8 | 44 |
| 8 | Reading | 28 | 13 | 5 | 10 | 43 | 41 | 2 | 44 |
| 9 | Bolton WanderersBolton | 29 | 13 | 5 | 11 | 43 | 43 | 0 | 44 |
| 10 | Barnsley | 29 | 12 | 7 | 10 | 41 | 39 | 2 | 43 |
| 11 | Stevenage | 27 | 11 | 7 | 9 | 27 | 25 | 2 | 40 |
| 12 | Lincoln CityLincoln | 29 | 10 | 9 | 10 | 35 | 34 | 1 | 39 |
| 13 | Blackpool | 28 | 9 | 11 | 8 | 41 | 40 | 1 | 38 |
| 14 | Mansfield TownMansfield | 27 | 11 | 4 | 12 | 35 | 34 | 1 | 37 |
| 15 | Rotherham UnitedRotherham | 28 | 10 | 7 | 11 | 33 | 33 | 0 | 37 |
| 16 | Wigan AthleticWigan | 28 | 9 | 7 | 12 | 27 | 28 | -1 | 34 |
| 17 | Exeter CityExeter | 29 | 9 | 5 | 15 | 33 | 46 | -13 | 32 |
| 18 | Bristol Rovers | 28 | 9 | 4 | 15 | 28 | 44 | -16 | 31 |
| 19 | Peterborough UnitedPeterborough | 29 | 8 | 6 | 15 | 45 | 55 | -10 | 30 |
| 20 | Northampton TownNorthampton | 29 | 7 | 9 | 13 | 28 | 45 | -17 | 30 |
| 21 | Burton Albion | 29 | 5 | 10 | 14 | 30 | 44 | -14 | 25 |
| 22 | Crawley TownCrawley | 27 | 6 | 6 | 15 | 27 | 48 | -21 | 24 |
| 23 | Shrewsbury TownShrewsbury | 28 | 6 | 5 | 17 | 28 | 48 | -20 | 23 |
| 24 | Cambridge UnitedCambridge | 28 | 5 | 7 | 16 | 29 | 50 | -21 | 22 |
| > League One Full Table | |||||||||
