22-year-old Rosaldo arrives from Sporting Lisbon, while compatriot Henrique has joined from Academica De Coimbra.
Rovers have also signed Polish goalkeeper Grzegorz Sandomierski on a season-long loan from Belgium side Genk.
Steve Kean's unbeaten side travel to Leeds United on Saturday, although none of the trio was registered in time for the game.
Restore Data
| Team | P | W | D | L | F | A | GD | PTS | |
| 1 | Manchester CityMan City | 15 | 11 | 2 | 2 | 32 | 9 | 23 | 35 |
| 2 | Liverpool | 15 | 10 | 4 | 1 | 44 | 12 | 32 | 34 |
| 3 | Chelsea | 15 | 10 | 3 | 2 | 35 | 9 | 26 | 33 |
| 4 | West Ham UnitedWest Ham | 15 | 8 | 3 | 4 | 28 | 19 | 9 | 27 |
| 5 | Tottenham HotspurSpurs | 14 | 8 | 1 | 5 | 16 | 17 | -1 | 25 |
| 6 | Manchester UnitedMan Utd | 15 | 7 | 3 | 5 | 25 | 24 | 1 | 24 |
| 7 | Arsenal | 14 | 7 | 2 | 5 | 17 | 20 | -3 | 23 |
| 8 | Wolverhampton WanderersWolves | 15 | 6 | 3 | 6 | 12 | 13 | -1 | 21 |
| 9 | Brighton & Hove AlbionBrighton | 15 | 4 | 8 | 3 | 14 | 16 | -2 | 20 |
| 10 | Aston Villa | 15 | 6 | 1 | 8 | 21 | 24 | -3 | 19 |
| 11 | Leicester CityLeicester | 15 | 5 | 4 | 6 | 23 | 27 | -4 | 19 |
| 12 | Brentford | 15 | 4 | 5 | 6 | 19 | 21 | -2 | 17 |
| 13 | Crystal Palace | 15 | 3 | 7 | 5 | 19 | 21 | -2 | 16 |
| 14 | Leeds UnitedLeeds | 15 | 3 | 7 | 5 | 15 | 22 | -7 | 16 |
| 15 | Southampton | 15 | 3 | 7 | 5 | 14 | 21 | -7 | 16 |
| 16 | Everton | 14 | 4 | 3 | 7 | 17 | 24 | -7 | 15 |
| 17 | Watford | 15 | 4 | 1 | 10 | 20 | 29 | -9 | 13 |
| 18 | Burnley | 14 | 1 | 7 | 6 | 14 | 21 | -7 | 10 |
| 19 | Newcastle UnitedNewcastle | 15 | 1 | 7 | 7 | 17 | 30 | -13 | 10 |
| 20 | Norwich CityNorwich | 15 | 2 | 4 | 9 | 8 | 31 | -23 | 10 |
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